Answer:
a. The formula for finding the number of colonies in a given volume is,
CFU/ml, here CFU is the colony forming units or the number of colonies formed in a volume plated in ml × dilution
The dilution factor given in the question is 1 × 10⁻⁴ and the number of colonies given is 186. Therefore, the number of bacteria present in the given 1 ml of the milk is,
CFU/ ml = 186 / 1 × 10⁻⁴ = 186 × 10⁴.
Hence, the concentration of bacteria in the milk is 186 × 10⁴ CFU/ml.
b) The limit of the bacterial concentration in the pasteurized milk is 20000 CFU/ml, however, it can be seen that the sample of the milk possess more concentration of bacteria than the desired value. Therefore, the milk is not safe to drink by Public Health Standards.
ABO blood typing uses 3 alleles. From your course notes answer the following two questions: Which two are dominant? _________ Write the two dominant allele genotypes, using the capital letter I, and then a superscript for each of them. __
Answer and Explanation:
Given that the ABO blood typing uses 3 alleles
The blood type of ABO could find out by considering three different alleles i.e [tex]I^{A}, I^{B}\ and \ i[/tex]
where,
[tex]I^{A}\ and\ I^{B}[/tex] = co-dominant
i = recessive
The dominant allele genotypes are as follows
For type A = [tex]I^{A} I^{A}/ I^{A}\ i[/tex]
For type B = [tex]I^{B} I^{B}/ I^{B}\ i[/tex]
For type AB = [tex]I^{A} I^{B}[/tex]
Therefore the above two are dominants and the same is to be considered
About how much energy is transferred from a primary consumer to a secondary consumer?
90% of the original energy from the Sun
10% of the original energy from the Sun
10% of the primary consumer's energy
O 1% of the primary consumer's energy
wi
Answer:
90 percent of the original energy from the sun
Answer:
10% of the primary consumer's energy
Explanation:
Many of the quantitative methods discussed are popular because they enable the microbiology researcher to selectively count live cells only. Why do you think this might be an important or desirable feature in a medical or environmental research situation? Provide a scenario in which it might not be important to differentiate between live and dead cells when counting cell numbers.
Answer:
to count cancer cells killed during chemotherapy
Explanation:
There are different methods for counting live cells and they include, among others, counting chambers (e.g., a hemocytometer), image analysis, flow cytometry, spectrophotometric techniques, impedance detection, etc. These laboratory techniques can be used to detect both live and dead cells. In flow cytometry, for instance, it is possible to detect death cells by analyzing the loss of membrane integrity, which is an indicator of death. However, in certain situations, is not required to differentiate between live and dead cells, and thus it is only required to know the number of cells that a sample contains (for example, for counting the number of immortalized cells cultured over several generations).
Answer:
b
Explanation:
edge 2021 :p
You observed many sand hill cranes on your walk. Two sand hill cranes flapped their wings and hopped up and down when you walked on the path near where their bright orange baby stood. You observed a(n) _______________.
Answer:
This question lacks options, the options are:
A) symbiosis
B) ecosystem
C) community
D) population
E) biosphere
The answer is D) Population
Explanation:
Living organisms in an ecosystem are usually found in numbers living together in a given area. This is termed POPULATION in ecology. A population refers to the group of living organisms that belongs to the same species living together in the same habitat and have the ability to interbreed i.e. mate and reproduce with one another.
This is the case in this question where many sandhill cranes (large flying birds) were observed in a particular area, which represented their habitat. Asides the group of sandhill cranes living together, they were also observed to be interbreeding. This was evident in the observation of two sandhill cranes hopping up and down around their bright orange baby. This shows that members of the population are capable of mating and reproducing fertile offsprings.
This observation completes what a POPULATION is all about, hence, a population was observed.
Examine the data presented and find the statement that represents an inference or something rather than observation
Answer:
The correct option is D: The blemishes are cyclic in their appearance and disappearance.
Explanation:
The rest of the options given state an observation, as opposed to an inference, regarding the data on the chart. An observation is something you can just read off from the chart/given data, whereas an inference would be something you conclude based on what is being presented in front of you.
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Answer:
[tex]\boxed{Option \ 2}[/tex]
Explanation:
=> In the first graph, we come to know that winters are colder and summers are hotter.
=> In the second graph, winters have more precipitation than summer.
=> On the whole, Winters have lower temperature and more precipitation than summers. ← [Option 2]
=> Summers have high temperatures and less precipitation.
Answer:
[tex]\boxed{\sf Option \ 2}[/tex]
Explanation:
We can see in the first graph that the winter months have a lower temperature compared to the summer months. The summer months have higher temperatures.
In the second graph, the winter months have much higher average precipitation compared to the summer months. The summer months have lower average precipitation.
Winters have lower temperatures and more precipitation than summers.
What can a person do to limit exposure to X-rays?
wear sunblock
avoid cigarette smoke
wear a protective vest avoid chemicals
X-rays are a form of indirectly ionizing radiation, and it can be really nocive to the humans health, so limiting the exposure is always a priority.
Here the correct option is wearing a protective vest.
-------------------------------------
X-rays are a form of radiation that is indirectly ionizing. Remember that ionization is what causes damage to our cells, so is better to avoid exposures to these types of radiation.
Now, X-rays are strong enough that they can penetrate a lot of common materials (like wood, plastic, etc.) And once it enters in your body, the chain of reactions that starts can't be stoped by external means.
So what you need to do is limit the exposure as much as you can. Ideally, you shouldn't be near a source of X-rays, but if there is no other option, you should use protection against radiation.
It comes in different forms depending on what the application is, for example, there are led screens that you can use to put between you and the source, and these will reduce drastically the fluence (flux of photons) that gets to you.
Similarly, there are protective vests also made in part of led or other high atomic number materials, that absorb the photons and protect you.
So here the correct option is to wear a protective vest, from the given options, is the only one that will protect you from the X-rays.
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Match the organelle to its function.
A) turgor pressure
B) ribosome production
C) support and flexibility
D) synthesis of complex polysaccharides
E) photosynthesis
F) synthesis of secretory proteins
G) detoxification of hydrogen peroxide
H) contains pigments in flowers
I) storage of hydrolase
J) boundary of the cell
K) protein synthesis
L) oxidation of sugars
M) cell shape and movement of organelles
N) information center
O) steroid synthesis
1) nucleus
2) mitochondrion
3) chloroplast
4) nucleolus
5) rough endoplasmic reticulum
6) smooth endoplasmic reticulum
7) extracellular matrix
8) cytoskeleton
9) chromoplast
10) Golgi complex
11) lysosome
12) peroxisome
13) central vacuole
14) ribosome
15) plasma membrane
Answer:
Explanation:
This involves organic present in plant cell and the functions of all these various organelles.
A) turgor pressure - Central vacuole
B) ribosome production - nucleolus
C) support and flexibility - cytoskeleton
D) synthesis of complex polysaccharides - Golgi complex
E) photosynthesis - chloroplast
F) synthesis of secretory proteins - rough endoplasmic reticulum
G) detoxification of hydrogen peroxide - Peroxisomes
H) contains pigments in flowers - chromoplasts
I) storage of hydrolase - lysosomes
J) boundary of the cell - plasma memebrane
K) protein synthesis - ribosome
L) oxidation of sugars - Mitochondrion
M) cell shape and movement of organelles - cytoskeleton
N) information center - nucleus
O) steroid synthesis - Smooth endoplasmic reticulum
Which of the following statements best describes communication style versatility?
The early bird gets the worm.
You can t judge a book by its cover.
I cannot control you, but I can control myself
alf a loa better than none
Answer:
I cannot control you but I can control myself.
Explanation:
Communication style versality is the ability to identify and understand way or taste of communication and adapt to it in order to make people open and receptive to it there by creating intimate relationships with people.
The features of communication style versality is I cannot control you but I can control myself in the sense that I will have to understand different styles and communication preference, then adapt to it by controlling myself, in me controlling myself people will tend to be open and receptive to it and intimate relationships will be built. I can't control other people but I will have to control or work on myself.
Which behavior is an instinct?
A.pigeon begins visiting a local park to look for dropped crumbs.
B. A pet dog sits and waits for a treat after its daily walk.
C. A deer gets used to hikers walking by and stops running away.
D. A newborn piglet drinks its mother's milk.
An instinct is: D. A newborn piglet drinks its mother's milk
Answer:
D. A newborn piglet sticks it's mother's milk.
Explanation:
Because that is natural and all the others adapted to the other stuff, a piglet drinking it's mother's milk is natural.
Why do Mars and Mercury have many more craters compared to Venus?
Answer:
They have a thinner atmosphere.
Explanation:
Venus has a very dense atmosphere compared to Mars and Mercury. This causes many small meteorites and asteroids to break apart before they reach the surface. Thus, Venus has fewer craters than Mars and Mercury.
Answer Choices:
◎ Their masses are greater.
◉ They have a thinner atmosphere. Correct!
◎ Both are closer to the sun than Venus.
◎ Their masses are lower.
Explanation:
Venus has a very dense atmosphere compared to Mars and Mercury. This causes many small meteorites and asteroids to break apart before they reach the surface. Thus, Venus has fewer craters than Mars and Mercury.
Merlin’s paper discusses two types of data: artifactual and paleoethnobotanical. Give specific examples of each and describe the sources of data and the type of information you can gain.
Answer:
Merlin's paper discusses two types of data: artifactual and paleoethnobotanical. Give specific examples of each and describe the sources of data and the ...
Write the sequence of the RNA strand that would be complementary to the DNA
sequence shown below.
TACCGATGG
Answer:
AUGGCUACC
Explanation:
RNA has three nucleotides in common with DNA: A (Adenine), C (Cytosine), and G (Guanine). However, T (Thymine) in DNA is replaced with U (Uracil) in RNA. A pairs with U, T pairs with A, and C pairs with G and vice versa.
So, the sequence will go like this:
TACCGATGG (DNA)
AUGGCUACC (RNA)
Hope this helps.
What must occur for protein translation to begin? A water molecule must be added to the protein chain. A peptide bond must form between subunits of mRNA. The amino acid Cys must be picked up by tRNA. The codon AUG must be identified.
For protein translation to begin, the codon AUG must be identified.
PROTEIN SYNTHESIS:
Protein synthesis is the process whereby living organisms synthesize proteins using the information stored in their DNA. Protein synthesis involves transcription and translation. Transcription occurs in the nucleus where DNA is used as a template to synthesize mRNA. Translation occurs in the ribosome where mRNA transcript is used to synthesize amino acid sequence. During translation, mRNA codons are read and binded to by the anticodons of a tRNA molecule.However, for translation to begin, a specific mRNA codon called START CODON with the sequence: AUG must be identified first.
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Answer: The correct answer is The codon AUG must be identified.
Explanation: Confirmed correct. :)
What is the color of the rainbow
Answer:
VIOLET INDIGO BLUE GREEN YELLOW ORANGE RED
Which best explains the evolution of gymnosperm plants? They evolved at the same time as monocots and dicots. They evolved after the seeded flowering plants. They evolved after the seedless vascular plants. They evolved before the seedless nonvascular plants.
Answer:
They evolved after the seedless vascular plants.
Explanation:
The gymnosperms were the first seed plants to have evolved some about 382.7 million to 358.9 million years ago in the Devonian period. They were the ancestor of the seed plants like the heterosporous, earlier gymnosperms were pteridosperms or seed ferns. The vascular plant's particular ferns consist of tissues that don't make flowers or seeds but have unicellular pores.Answer:
the answer is C- They evolved after the seedless vascular plants.
Explanation:
The___is the fluid component of blood.
Answer:
It is plasma
Explanation:
Plasma is the fluid component of blood
Plasma, a combination of water, sugar, fat, protein, and salts, is the term for the liquid portion of blood.
What is Blood?Blood is a bodily fluid found in the circulatory systems of humans and other animals that carries metabolic byproducts away from the cells as well as vital nutrients and oxygen to the cells.
Plasma, blood cells, and platelets are the main components of blood, which is a fluid made up of connective tissue. It moves throughout our body, supplying different cells and tissues with nutrition and oxygen. 8% of our total weight is made up of it. A typical adult has between 5 and 6 litres of blood. Red blood cells, white blood cells, platelets, and plasma are all components of the fluid connective tissue known as blood.
Therefore, Plasma, a combination of water, sugar, fat, protein, and salts, is the term for the liquid portion of blood.
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Loyeulis,
iv. All of these
b) What do seeds need to grow into new plants?
1. Air
ii. Water
iii. Right amount of warmth
c) Potatoes grow from
iv. leaves.
Answer: air , water , right amount of warmth
Explanation:
Which feature separates humans from other primates? smaller brain size bipedalism use of tools complex social skills
Answer:
Complex social skills
Explanation:
Answer:
Complex social skills.
Explanation:
Humans actually have larger brains than other primates, so smaller brain size is incorrect.
Other primates, such as chimpanzees, orangutans, and gorillas, all have the ability to use tools, so that is incorrect.
Some primates, such as chimps and baboons, do stand on their hind legs at times, so bipedalism does not separate humans from other primates.
So, complex social skills separate humans from primates.
Hope this helps!
A student recorded the height of each student in the school. She then made a bar graph of her results. She observed
that the results form a bell-shaped curve. The student could use her graph as evidence to support which argument?
Height is affected by multiple pairs of genes on different chromosomes.
tre weles for tall height and short height are codominant.
the allele for being tall is dominant to the allele for shorter heights.
There are three alleles for height that demonstrate incomplete dominance
Answer:
Height is affected by multiple pairs of genes on different chromosomes.
Explanation:
The quantitative traits are those whose inheritance pattern is the result of the action of multiple genes that act together with the environment. The distribution of quantitative traits in the population follows a bell-shaped curve, which is referred to as normal distribution or Gaussian distribution. These traits are 'quantitative' because they vary among individuals in the population to produce a continuous range of phenotypic values. Examples of quantitative traits include, among others, metabolic rate, height, and weight.
Answer:
A)
Explanation:
got 100%
Why is it important to classify the millions of species on Earth? to have common names that everyone can remember to more easily sequence their genetic material to devise scientific names that only scientists can learn to organize them and speak about them accurately
Answer:
to organize them and speak about them accurately.
Explanation:
organisms are classified to understand the relationships between all living things.
Answer:
D
Explanation:
At low frequencies during DNA replication, an extra nucleotide maybe inserted into the DNA strand. If this occurs within a gene, what would be the effect on the protein product
Answer:
1. It could result in a loss of function of the protein product
2. It could result in a protein product with excessive activity
3. It could result in altered structure of the protein
Explanation:
Any changes that occur in the nucleotide sequence in the DNA of an organism is known as a mutation. Various forms of mutation can occur in the DNA sequence of an organism which could be as a result of insertion or deletion of a nucleotide in the DNA sequence.
Insertion of an extra nucleotide into a DNA strand within a gene could have any of the following effects on the protein protein;
1. It could result in a loss of function of the protein product of the gene whereby the protein can no longer carry out its normal functions
2. It could result in a protein product with excessive activity other the normal range at which it functions.
3. It could result in altered structure of the protein either in the primary, secondary, tertiary, or quaternary structure
The leading cause of peptic ulcer disease is currently believed to be infection of the stomach by a bacteria is called
A. Helicobacter pylori
B. Streptococcus
C, Helicobacter pyogens
D. Streptococcal pylorus
Answer:
A. Helicobacter pylori
hope this is the correct answer
I tried my best
stay at home stay safe
Answer:
The leading cause of peptic ulcer disease is currently believed to be infection of the stomach by a bacteria is called Helicobacter pylori.
Explanation:
An infection that develops from Helicobacter pylori bacteria is one of the most common causes of peptic ulcers. It’s not clear how an H. pylori infection spreads, but it is believed that it may be transmitted from person to person through close contact.
Hope this helps :)
Do you agree or disagree with the argument that humans are fundamentally incapable, as a species, of living sustainably?
Answer:
I disagree because there are examples that contradict this assertion
Explanation:
In the last years, sustainable human development has been one of the most important challenges in order to avoid Earth's collapse. In accordance with this aim, many people around the world are learning to responsibility use natural resources and live in communion with ecosystems capable of providing the primary matter required for economic progress. Examples of human groups that learned to use the available resources in a sustainable way include isolated societies living in forest areas, which live independently from the external globalization phenomenon. Moreover, in many countries, the percentage of energy obtained from clean sources is progressively increasing year by year, thereby supporting the fact that human societies can live sustainably.
The papillae located mainly on the tip and sides of the tongue that contain only a few taste buds each are the _______ papillae
Answer:
Fungiform
Explanation:
The papillae located mainly on the tip and sides of the tongue that contain only a few taste buds each are the Fungiform papillae.
The fungiform papillae are broad flat structures that house taste buds in the central portion of the dorsum (back) of the tongue. These papillae were thought to resemble a fungus: a little mushroom. The literal meaning of Fungiform is mushroom-shaped.
Anemia includes: a. A lack of WBCs b. A lack of Hgb c. Numerous amounts of RBCs d. Numerous amounts of WBCs
Anemia is a lack of hemoglobin(Hgb). The name is derived from latin (a- meaning lack of) (emia-means red)
Based on your knowledge of the genetic tools for studying baker's yeast, how would you clone the genes that are mutated in your respective yeast strains?
Answer:
By using specific primers for PCR amplification and DNA sequencing
Explanation:
In molecular biology, different techniques are used to clone the full sequence of desired genes. In general, gene cloning is based on the assembly of genetically engineered recombinant DNA cloning vectors into host organisms. The cloning procedure generally consists of isolating target DNA sequences to be cloned, ligation into a corresponding vector, transfection and screening of clones. The recombinant DNA is first amplified by PCR. Subsequently, DNA is sequenced and finally assembled by bioinformatic methods in order to characterize the full sequence of the gene.
Which feature separates humans from other primates? smaller brain size bipedalism use of tools complex social skills
Answer:
Bipedalism.
Explanation:
Bipedalism is a human's ability in which they can use their two hind legs to run or walk without the help of their front limbs, unlike other primates.
Answer:
Bipedalism
Explanation:
i took the test and failed
How did the research presented in the article affect scientists’ understanding of the evolution of eukaryotes.
Answer:
Archaea and eukaryotes are very closely related than bacteria and eukaryotes. because both archaea and bacteria responsible for the formation of more complex cells
Explanation:
It has been believed for many years that archaea and eukaryotic cells are genetically related to a developmental process that involves the production of eukaryotic cells by archaea development. At the same time, scientists believe that archaea have more to do with eukaryotic cells than bacteria. This is because research shows that bacteria are also closely related to eukaryotic cells, meaning that along with archaea, bacteria are part of the evolutionary process that makes up these cells.The uterine cycle describes the cyclic changes of thickening and degeneration that the endometrium goes through in a month. What is the order of events in one uterine cycle
Answer:
During the uterine month there are different phases through which the uterus passes, these phases are regulated by hormones and are responsible for producing the cycle necessary for fertilization.
Phase where menstruation occurs: This phase only happens if the woman was not fertilized and did not develop the diploid cell together with a sperm, since not being fertilized, all the uterine preparation that had been planned in the body for fertilization will be released as that we know "menstruation", in this phase estrogens and progesterone are low. The inner walls of the unfertilized uterus are released.
Follicular phase, in the follicular phase the ovaries prepare to release an egg and estrogen begins to rise. (From the first day of the period until ovulation)
Proliferative phase, in the proliferative phase, new vessels proliferate and the outermost layer of the uterus prepares itself for possible fertilization, is where spiral arterioles can begin to form again in the external cut of the myometrium.
Ovulation, here is where the mature ovum is called Graff's follicle, at this time estrogen reaches its peak and then descends.
Luteal phase, in the luteal phase the production of the luteal body is generated, at this stage progesterone takes center stage, and it is the range between ovulation and menstruation (if not fertilized)
Last phase, secret phase, in this phase there are two possible ends, if the woman is fertilized, the egg cell implants and begins the development of the embryo and if it is not fertilized, the entire external cut of the myometrium is prepared to be secreted.
Explanation:
A very important fact to clarify is that women are born with a quantity of ovules that at the end of this uterine cycle ceases to exist, this process is what we know as menopause.
That is to say that women have a quantity of ovules that will one day run out, and the body releases them from the menarche or the first menstruation, generating that in each released ovule a uterine cycle is completed, the day they end the woman will have reached menopause and would have no chance of being fertilized or completing the uterine cycle.
superficial layer of the endometrium is shed
basal layer of endometrium grows, forms gland and blood vessels
enriched endometrial blood supply
endometrial glands secrete nutrients into uterus