Answer:
four requirements for natural selection are given below:
Mutations
Variation in reproductive success
Sexual reproduction
Adaptations
Explanation:
Suppose you found two species of cave-dwelling lizards without eyes living on
opposite sides of the world. Explain how you would try to determine if the two
species were closely related.
Answer:
Two species are more related if they have a more recent common ancestor, and less related if they have a less recent common ancestor.
Explanation:
Antibiotics interfere with prokaryotic cell functions. Streptomycin is an antibiotic that interferes with the proper binding of tRNA to mRNA in prokaryotic ribosomes. Which of the following best predicts the most direct effect of exposing prokaryotic cells to streptomycin?
A. Amino acid synthesis will be inhibited.
B. No mRNA will be transcribed from DNA
C. Posttranslational modifications will be prevented.
D. Synthesis of polypeptides will be inhibited.
Answer:
The correct answer is D. Synthesis of polypeptides will be inhibited.
Explanation:
Streptomycin is an aminoglycoside antibiotic. Aminoglycosides are actively transported across the bacterial membrane, irreversibly bind to one or more receptor proteins specific to the 30S subunit of bacterial ribosomes, and interfere with the initiation complex between messenger RNA and the 30S subunit. DNA can be misread, leading to the production of non-functional proteins; polyribosomes separate and are unable to synthesize proteins. This results in accelerated transport of aminoglycosides, thereby increasing the breakdown of the cytoplasmic membranes of the bacteria and consequent cell death. Streptomycin specifically binds and inhibits the ribosomes of bacteria because the ribosomes of prokaryotic cells are not the same as those of eukaryotic cells. Specifically, it blocks the normal activity of the initiation complex, thereby halting protein synthesis and, on the other, it causes the incorporation of other amino acid different than the one encoded.
A medicine or substance that inhibits the growth and infection of bacteria and other agents are called antibiotics. They treat and prevent microbial or bacterial infections.
On direct exposing of prokaryotic cells to streptomycin, the option D. synthesis of polypeptides will be inhibited.
The mechanism of antibiotics can be explained as:Streptomycin is a type of antibiotic that is aminoglycoside in nature which binds to the protein receptors and interferes with the initiation complex present between the ribosomal unit and mRNA.The interference can cause misleading information read by the DNA and as a result producing non-functional proteins or no synthesis of proteins.This misleading information will result in an increased amount of aminoglycosides transportation across the membrane of bacteria and its degradation.It binds to the ribosomal unit of bacteria as they are unique to them and not eukaryotes so that they do not harm eukaryotic organisms.Therefore, antibiotics block polypeptide synthesis.
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what happens when you just have 1 kidney
Answer:
Most people with a single kidney live a normal life without developing any long- or short-term problems. However, the risk of developing mild high blood pressure, fluid retention, and proteinuria is slightly higher if you have one kidney instead of two.
help due in 15 mins:(
Answer:
16
Explanation:
The inheritance of biological characteristics is determined by individual units called ___, which are passed from parents to offspring. Where two or more ___ of the gene for a single trait exist, some alleles may be ___ and others may be recessive. In most ___ organisms, each adult has ___ of each gene. These genes ___ from each other when ___ are formed. Alleles for different genes usually segregate ___ of each other.
Answer:
genes, alleles, dominant, sexually reproducing, two copies, segregate, gametes, independently
Explanation:
The inheritance of biological characteristics is determined by individual units called *genes*, which are passed from parents to offspring. Where two or more *alleles* of the gene for a single trait exist, some alleles may be *dominant* and others may be recessive. In most *sexually reproducing* organisms, each adult has *two copies* of each gene. These genes *segregate* from each other when *gametes* are formed. Alleles for different genes usually segregate *independently* of each other.
The inheritance of biological characteristics is determined by individual units called genes, which are passed from parents to offspring. Where two or more alleles of the gene for a single trait exist, some alleles may be dominant and others may be recessive. In most se-xually reproducing organisms, each adult has two copies of each gene. These genes segregate from each other when gamates are formed. Alleles for different genes usually segregate independently of each other.
GenesGenes are the unit of inheritance. It is the basic functional unit of heredity. Genes are made up of DNA.
AllelesAlleles are variant form of a genes
Dominant allelesDominant alleles are variation of a gene that will produce a certain phenotype, even in the presence of other alleles.
GamatesThey are male and female reproductive se-x cells
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which RNA molecule carries amino acids
Answer:
Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell's ribosomes (the structures in which protein synthesis takes place); and transfer RNA (tRNA) molecules carry amino acids to the ribosomes during protein
What is the result of adding these two equations?
−
5
x
−
9
y
=
3
5
x
−
9
y
=
−
2
−5x−9y
5x−9y
=3
=−2
Answer:
[tex] - 18y = 1[/tex]
y=-1/18
A component of the wet slurry produced by the scrubbing process is ?
Answer:
During wet lime injection, a slurry of limestone (CaCO3) is sprayed into the spray column. The presence of SO2 causes gypsum (CaSO4. 2H2O) to be produced. Originally, the process was made up of two absorbers and an oxidation unit.
Explanation:
when the cell concentrates potassium within against the natural tendency of matter it is performing
Sally says her stomach and liver have nothing to do with her heart and blood, and that they are completely separate.
What did she say that is wrong?
What would be the correct statement?
What are the facts you’d use to correct her?
Answer:
The liver and heart work as a team. The liver filters blood pumped by the heart.
Explain the 2 types of gene mutations.
how do government subsidies contribute to inefficient use of water?
Answer:
They dont lOlololoLOlololOl
Explanation:
The driving force presented by Wegener for his hypothesis was that continents ploughed through ocean crust.
Answer:
"Alfred Wegener suggested that continental drift occurred as continents cut through the ocean floor, in the same way as this icebreaker plows through sea ice. ... The supercontinent later broke apart and the continents having been moving into their current positions ever since. He called his hypothesis continental drift."
Your teacher has given you two mineral samples. He has told you that
they have the same crystal structure and hardness.
Which other observation would suggest that they are MOST LIKELY the
same mineral?
They have the same color.
They have the same shape.
They have the same size.
They have the same mass.
What condition can increase the amount of starch produced in the plant- more light, more oxygen, or more glucose?
Answer:
photosynthesis
Explanation:
A Phylum is a more broad taxonomic category than an order.
O True
O False
True.
Hope this helps. :)
Could you explain the roles and relationships among producers, consumers, and decomposers, and identify the distinguished characteristics of several common relationships among organisms in an ecosystem near you?
Answer:
A consumer may also eat other consumers as food. When producers and consumers die, the Decomposer will come along to decompose (break down) the bodies of the dead producers and consumers into smaller chemicals - in short treating them as a food source
Explanation:
Your welcome have a good day :)
The producers, consumers, and decomposers are related to each other in an ecosystem in a specific way.
What is an Ecosystem?The interaction between the organisms of different species plays their role in a systematic way as decided by natural selection, which is known as the Ecosystem.
Producers use light energy and inorganic matter to produce food. They are always present first in the ecosystem. Consumers take energy from plants known as herbivores, and also from herbivores known as Carnivores. Decomposers convert dead organic matter into inorganic matter. This inorganic matter helps producers perform metabolic activities. And finally, this cycle goes on.
Therefore, the producers, consumers, and decomposers are related to each other in an ecosystem in a specific way.
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Question 1
Which of the following statements about the resting membrane potential is TRUE?
Multiple choice question.
A)
The exterior of the cell has a net positive charge and the interior is neutral.
B)
The exterior of the cell has a net positive charge and the interior has a net negative charge.
C)
The exterior of the cell has a net negative charge and the interior is neutral.
D)
The exterior of the cell is neutral and the interior has a net negative charge.
E)
The exterior of the cell has a net negative charge and the interior has a net positive charge.
Answer:
B)
The exterior of the cell has a net positive charge and the interior has a net negative charge.
Explanation:
The statement about the resting membrane potential 'the exterior of the cell has a net positive charge and the interior has a net negative charge' is TRUE (Option B).
The resting potential refers to the electrical potential charges produced by the separation of opposite charges across biological membranes.At the resting potential, a cell has a negative charge due to the accumulation of more sodium (Na+) ions outside the cell than potassium (K+) in the interior of the cell.For example, a neuron is 70 millivolts more negative than the outside medium at its resting potential.In conclusion, the statement about the resting membrane potential 'the exterior of the cell has a net positive charge and the interior has a net negative charge' is TRUE (Option B).
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A pure-breeding, tall pea plant with white flowers is crossed with a pure-breeding, short plant with red flowers. The F1 plants are tall, with red flowers. When allowed to fertilize themselves, these produce the following F2: 326 tall, red; 104 tall, white; 117 short, red; and 29 short, white. You are conducting a Chi-Square analysis and what is the null hypothesis?
Answer:
Null Hypothesis -
The observed frequency is approximately equal to the expected frequency of phenotype.
Explanation:
Pure Breeding Cross - TTww x ttWW
Genotype of offspring in F2 generation - TtWw
Null Hypothesis -
The observed frequency is approximately equal to the expected frequency of phenotype.
The chi square analysis is attached
The degree of freedom for this question is 3
The p value for X^2 estimated through chi square test is 0.5
Hence the null hypothesis is accepted.
Your job is to write out a story about the Tissue Family Reunion which includes the following family members: epithelial, connective, nervous, muscular. All of the tissues have “Grown Up” and moved away from home. Each now lives in a new place and has their own job and they have come home for the annual family reunion. Your job is to write a story that details their conversation as they all get together and discuss where they “live” and what they now “do.” It is your decision as to the format that you would like to use. For example, you could write a story in paragraph or script formats that identifies the job and location of each tissue. To help with this process, you will want to give each one of your tissues a name.
The tissues you have to include are epithelium, connective, nervous, and muscle tissues. Please answer before Febuary 12, 2021. It has to be a paragraph and give them names. Since this requires a lot of thinking and creativity it is worth 80 points.
Answer: Write out a story about the Tissue Family Reunion which includes the following family members: epithelial, connective, nervous, muscular. All of the tissues have “grown up” and moved away from home. Each now lives in a new place and has their own job and they have come home for the anual family reunion.Your job is write story that details their conversation as they all get together and discuss where they ” live” and what the now “do”. It is your decision as to the format that you would like to use. For edxample you could write story in paragraph that identifies the job and location of each
Explanation:
The Tissue Family Reunion which includes the following family members: epithelial, connective, nervous, muscular. All of the tissues have “grown up” and moved away from home.
What are Meristem cells?Meristem cells are totipotent meaning they can differentiate to any type of plant cells. Therefore they can produce a variety of plant type depending on epigenetic. However, tissue culture is derived from already differentiated cells. These cells are already determined and can only produce cell type of that plant from which they were derived.
Gene therapy is a method of using genetic material to treat or prevent certain diseases. A common method researchers have found to accomplish this is with vectors. Vectors are essentially vehicles designed to deliver therapeutic genetic material, such as functional genes, directly to cells. A vector-valued function, also called a vector function, is a mathematical function of one or more variables whose extent is a multidimensional vector or a set of infinite-dimensional vectors.
Therefore, The Tissue Family Reunion which includes the following family members: epithelial, connective, nervous, muscular. All of the tissues have “grown up” and moved away from home.
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9. a) List four things that form or begin during the first trimester of pregnancy. (1 point)
Marking brainiest!
Answer:
The baby’s heart, spinal cord, skin, and red blood cells all begin to form during the first trimester of pregnancy.
Explanation:
Hope this helps! Have a nice day :)
6. In a population of angiosperms in Hardy-Weinberg equilibrium, the allele, C, conferring red flowers is completely dominant to the allele, c, causing white flowers. If allele C is at frequency 0.7 in the population, what is the expected frequency of red flowered plants
Answer:
The correct answer is - 0.91.
Explanation:
Given that C is dominant over c with an allelic frequency of 0.7. The sum of the frequency of dominant alleles and the frequency of heterozygous alleles in this H-W population of angiosperm will be the expected frequency of red-flowered plants.
The frequency of C = 0.7
(p² = dominant allele frequency)
Then, the frequency of dominant genotype CC would be = 0.7×0.7 (p² = dominant allele frequency)
As we know that P + q = 1
then q = 1 - p
q (frequency of recessive allele) - 1 - 0.7
q = 0.3
Then frequency of heterozygous genotype Cc= 2pq
= 2×0.7×0.3
= 0.42
The frequency of red flowers = freq of CC + freq of Cc
= 0.49 + 0.42
= 0.91
Given that C is dominant over c with the frequency of 0.7
The sum of the frequency of dominant allele and heterozygous alleles in this H-W population of angiosperms expected frequency of red-flowered plants.
frequency of C = 0.7
[tex]p^{2} =dominant allele[/tex]
CC= 0.7 × 0.7
[tex]p+q =1\\q= 1- p\\= -1-0.7\\=0.3\\[/tex]
Then frequency of genoype = Cc= 2pq
= 2×0.7×0.3
= 0.42
[tex]frequency of red flower = freq of CC + freq of Cc[/tex]
= 0.49 + 0.42
= 0.91.
What is Hardy-Weinberg equilibrium?It is a principle that states genetic variation in a population will remain constant from one generation to the next generation in the absence of disturbing factors.
Hence concluded that the frequency of red-flowered plants = 0.91
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What are the strengths and limitations of this model?
The process of transcription results in the formation of
Answer: mRNA
Explanation:
In eukaryotes, cellular respiration takes place in the(1 point)
mitochondria.
nucleus.
cytoplasm.
cellular membrane.
Answer:
mitochondria
Explanation:
Aerobic respiration is characteristic of eukaryotic cells when they have sufficient oxygen and most of it takes place in the mitochondria.
In eukaryotes, cellular respiration takes place in the mitochondria.
WHAT IS CELLULAR RESPIRATION:Cellular respiration is the process whereby living organisms obtain energy in form of ATP by breaking down food molecules in their cells. Cellular respiration occurs in the mitochondria of eukaryotic cells but in the cytoplasm of prokaryotic cells. The mitochondria is a double membrane organelle commonly termed the power house of the cell because of the supply of ATP.Therefore, in eukaryotes, cellular respiration takes place in the mitochondria.
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During digestion what
energy is
transformed into another energy
Answer:
During digestion, the chemical energy found in our food can be converted to many different forms.
The chemical energy in food can be converted to another form of chemical energy when it is stored as glucose or fat. It can be converted to thermal energy because our body produces heat when disgusting our food.
Explanation:
I majored in Biology
Obliquity refers to the changes to the direction of Earth's tilt
A
True
B
False
Howmanychromosomes would be present in the sperm cells of a mosquito?
Answer:
23
Explanation:
Answer:
3
Explanation:
The only exception to the six chromosomes per cell rule for mosquitoes would be the gametes, or sex cells. When cells in the ovary or teste undergo meiosis, the result is egg or sperm cells which are haploid, meaning that they have just one copy of each chromosome, for a total of three chromosomes
Which gases contribute to the greenhouse effect?
nitrogen and helium
carbon dioxide and methane
carbon dioxide and helium
nitrogen and methane
Answer:
carbon dioxide and methane
Explanation:
there are the gasses that contribute to the greenhouse effect the most
The gases that contribute to the greenhouse effect are carbon dioxide and methane. Details about greenhouse effect can be found below.
What is greenhouse effect?Greenhouse effect refers to the process by which a planet is warmed by its atmosphere.
Greenhouse effect is also called global warming and is caused by the release of greenhouse gases into the atmosphere.
Greenhouse gases that contribute to the greenhouse effect are as follows:
ChlorofluorocarbonsMethaneCarbon dioxideTherefore, the gases that contribute to the greenhouse effect are carbon dioxide and methane.
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Which of the following are classified as blood vessels? Check all that apply.
ventricles
arteries
capillaries
lymph nodes
veins
I believe the answers are arteries, veins, and capillaries. (:
Answer:
arteries
capillaries
veins
Explanation: