Answer:
n order to function, cells are required to move materials in and out of their cytoplasm via their cell membranes. These membranes are semipermeable, meaning that certain molecules are allowed to pass through, but not others. This movement of molecules is mediated by the phospholipid bilayer and its embedded proteins, some of which act as transport channels for molecules that otherwise would not be able to pass through the membrane, such as ions and carbohydrates.
Which kind of soil do temperate climate areas usually have?
-Soil containing little to no organic material
-Soil rich in nutrients
-Soil with a layer mostly composed of clay
-Soil consisting primarily of tiny rock particles
Answer:
The second one will be your answer
Explanation:
before DNA was discovered, in which materials did scientists think the gentic material was stored? a. proteins b. carbohydrates, c. nucleic acids, d lipids
How did the development of the cell theory lay the foundation for the current advancements in stem cell research?
All organisms depend on stem cells for their survival. As an outcome, stem cells may be a requirement for the evolution of specific characteristics in organisms that include regeneration, multicellularity and coloniality.
What is stem cell theory?The stem cell theory of ageing proposes that the ageing process is the result of the inability of different types of stem cells to continue to replenish the tissues of an organism with functional differentiated cells capable of maintaining that tissue's original function.
Thus, stem cells may be a prerequisite for the evolution of specific characteristics in organisms that include regeneration, multicellularity and coloniality.
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which choice has eukaryotic animal cells?
lactobacillus
virus
liver
oak
While playing basketball, a student scrapes their knee. Which explanation best describes what organelles work together for the skin to heal after being cut?
A. The cell membrane controls the amount of energy released so that the lysosomes can give the command for cellular reproduction.
B. The mitochondria provides the energy for the cell membrane to control the process of cellular reproduction.
C. The chloroplasts provide nutrients for the nucleus to give instructions to the other organelles so that cellular reproduction can occur.
D. The nucleus gives instructions to begin cellular reproduction and duplicates the DNA, and the mitochondria makes the energy necessary for the process.
The explanation best describes organelles work together for the skin to heal after being cut is the nucleus gives instructions to begin cellular reproduction and duplicates the DNA, and the mitochondria makes the energy necessary for the process. Thus, option D is correct.
What is RNA and DNA?Ribonucleic acid (abbreviated RNA) is a nucleic acid present in all living cells that has structural similarities to DNA. Unlike DNA, however, RNA is most often single-stranded.
An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA.
Attached to each sugar is one of four bases: adenine (A), uracil (U), cytosine (C) or guanine (G). Friedrich miescher discovered DNA in the year of 1860.
In our body DNA is found in the nucleus of the cell and it is known as nuclear DNA. The shape of DNA is double helical structure.
Therefore, the explanation best describes organelles work together for the skin to heal after being cut is the nucleus gives instructions to begin cellular reproduction and duplicates the DNA, and the mitochondria makes the energy necessary for the process. Thus, option D is correct.
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When studying living organisms, why is it important to start with the cell first?
Answer:
To identity the type of cell.
Explanation:
Um I dunno
Explain what selective permeability is and how this relates to the cell membrane? pls help
Answer:
Well selectively permeable means that the membrane selects what goes in and out of the cell
Explanation:
Which of the following is NOT true of mutations?
a) They can take place in body cells or in reproductive cells.
b) They often lead to beneficial variations.
c) They can be caused by X rays.
d) They involve changes to genetic information.
Exposed to sunlight ---> Increased use of CO2 ---> ?
You are studying plants and your teacher has made a flowchart for a leaf. What phrase, if placed in box X, would correctly complete the flowchart above?
A. Increased amount of food production in the leaf because more carbon dioxide will increase the amount of photosynthesis occuring in the leaf.
B. Decreased amount of food production in the leaf because more carbon dioxide will increase the amount of photosynthesis occuring in the leaf.
C. Increased amount of food production in the leaf because more carbon dioxide will decrease the amount of photosynthesis occuring in the leaf
D. Decreased amount of food production in the leaf because more carbon dioxide will decrease the amount of photosynthesis occuring in the leaf.
When the plant is placed under the sunlight and the carbon dioxide, then an increased amount of food production occurs in the leaf because more carbon dioxide will increase the amount of photosynthesis occurring in the leaf, as is present in option A.
What is the role of photosynthesis?Photosynthesis is a process in which the plant needs carbon dioxide, sunlight, and water. When the plant is in normal condition and getting sufficient sunlight and carbon dioxide, the rate of photosynthesis increases, and the glucose synthesis increases too.
Hence, when the plant is placed under the sunlight and the carbon dioxide, an increased amount of food production occurs in the leaf because more carbon dioxide will increase the amount of photosynthesis occurring in the leaf, as is present in option A.
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A 20.0 g sample of metal with a specific heat of 1.50 J/(gºC) raised its temperature from 25 ºC to 100 ºC. How much heat in J was absorbed by the sample of metal?
a.)2,250 J
b.)5,276 J
c.)0.177 J
d.)750 J
Answer:
A
Explanation:
Please match the parts of the microscope with their function. Put the letter next to the part of the microscope that fits the description.
1. D
2. H
3. A
4. F
5. J
6. I
7. G
8. C
9. B
10. E
11. K
Correct match the parts of the microscope with their function -
1. Eyepiece - D 2. Base - H 3. Nosepiece - A 4. Stage - F 5. Coarse adjustment knob - J 6. DIaphragm - I 7. Stage clips - G 8. Fine adjustment knob - C 9. Objective lens - B 10. Arm - E 11. Light source - KParts of the microscope are:
Eyepiece or ocular - the part which is used to look through at the top of the microscope. Arm - it is used to carry a microscope. Objective lens - the primary optical lenses on a microscope ranging from 4x to 100x magnification power. Nosepiece - the part of a microscope to which the objective lenses are attached.Fine adjustment knob - A slow but precise control used to fine focus the image when viewing at the higher magnifications. Coarse adjustment knob - The coarse adjustment knob located on the arm of the microscope moves the stage up and down to bring the specimen into focus. Stage -This is a ledge where the specimen to be observed is placed. Stage clips - Clips on the stage that hold that is a glass slide on which the specimen has been mounted. Light source - This is the light source for a microscope usually located in the base of the microscope. diaphragm - This is a flexible structure that controls the amount of light reaching the specimen and is located above the condenser and below the stage. Base -This is the foot of the microscope and supports the whole frame of the microscope.Learn more:
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What variables can affect the number of fish in a lake
Answer:
well it could be the pollutoin or the amount of fish or predoators
Explanation:
also dont go word for word this is just a basais of things you could do
Answer:
How much people fish in the lake, how cold the weather gets, if there are any dangerous compounds added to the water, how many eggs the fish lay that spring...
Explanation:
Physical characteristics of sedimentary, metamorphic, and indigenous rocks?
Warm ocean currents cause major weather events, impacting animals and their survival. Which two main spheres are involved?
Atmosphere and biosphere
Geosphere and biosphere
Hydrosphere and biosphere
Atmosphere and hydrosphere
Answer:
hydrosphere and biosphere
Explanation:
i am 96% sure i'm right
this illustration shows a kind of animal that is a free living organism
which term is the common name of this organism?
A. Amoeba
B. Planarian
C. Fluke
D. Tapeworm
Answer: Planarian
This is the answer i know because i've seen them before
Answer:
b
Explanation:
plzz hhheeeelllllpppp mee! Which great scientist laid the ground work for the scientific method we use today?
Question 2 options:
A)
Aristotle
B)
Galileo
C)
Newton
Answer: b
Explanation:
if thats wrong then its c, hope this helped
How is a branching tree diagram used? (20 points!!)
Answer: It is used to break down broad categories into finer and finer levels of detail. Developing the tree diagram helps you move your thinking step by step from generalities to specifics.
Explanation:
How long can you leave an Abyssinian cat alone?
How are extrusive rocks formed?
Answer:
the rocks that form at erupting volcanoes and oozing fissures.
Explanation:
The DNA is organized in bundles called _______.
Answer:
Chromosomes
Explanation:
Hope this helps
Need help ASAP please!
In one paragraph, please justify the following argument: “Without the sun, I would be unable to move.” Discuss the processes of both photosynthesis and cellular respiration in your response, including the reactants and products of each.
It is true, without the sun we wouldn't be able to move because we need vitamin D and whatever. The sun is a very important thing, it makes people happy and warm. It also makes food for us. Without the sun, we'd all be dead. It's as simple as that. Sry if this is the totally wrong answer, I haven't seen the whole argument I don't believe.
-0229
In an electric motor, a force is applied to the electromagnet by
A. a battery
B. a commutator.
C. an electric current.
D. a permanent magnet.
An electric current
What is an electric current?
"Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere".
What are electromagnets?
"An electromagnet is a type of magnet in which the magnetic field is produced by an electric current".
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The models below illustrate cells that have been placed in solutions containing salt. The cell membrane is permeable to water, but not permeable to salt. In which model would water leave the cell, causing the cell shrink?
Cell Model A: INside-3% salt 96% water OUTside-1% salt 99% water
Cell Model B: INside 3% salt 97% water OUTside 3% salt 97% water
Cell Model C: INside 1% salt 99% water OUTside 3% salt 97% water
Cell Model D: INside 99% salt 1% water OUTside 97% salt 3% water
A. Cell b.
B. Cell c.
C. Cell a.
D. Cell d.
PLZZ HELP THIS DUE TODAY AND I STRESS OUT PLZZ HELP ME ONLY GIVE ME THE CORRECT ANSWER PLZZZ this due today !!!!HELPP
9. Doctors tested a patient to find out what molecules were in her cells. Her cells contained normal levels of oxygen molecules, low levels of amino acid molecules, and low levels of glucose molecules. Will this patient be able to exercise normally?
A. Yes, as long as her cells have enough oxygen, her body will be able to exercise.
B. No, her cells need glucose to react with oxygen to release enough energy to exercise.
C. No, her cells need amino acids to react with oxygen to release enough energy to exercise.
D. No, her cells need glucose to react with amino acids to release enough energy to exercise.
10. Asthma is a condition in which it can be very hard for a person to breathe in enough air. Would it also be difficult for someone with asthma to exercise?
A. No, as long as the person is getting enough sleep, he will make enough energy to exercise.
B. No, as long as the person's cells are getting different types of molecules from food, he can still exercise.
C. No, the person's cells may not have everything they need, but his body can still exercise normally.
D. Yes, it will be difficult for a person with asthma to exercise because his cells need molecules from air.
11. Jamal ate a meal of rice before seeing his doctor. Rice is made of mostly starch molecules. Jamal has been feeling tired a lot, so his doctor gave him a test that found that Jamal’s cells contained normal levels of oxygen and low levels of glucose. Does this explain why Jamal has been feeling tired?
A. Yes, Jamal's respiratory system is working, but his digestive system is not turning the oxygen into glucose.
B. Yes, Jamal's respiratory system is working, but his digestive system is not breaking down starch molecules into glucose for his cells.
C. Yes, Jamal's digestive system is working, but his respiratory system has too much oxygen, so his body stopped making energy.
D. No, something else must be wrong with Jamal because his cells have all the molecules they need.
12. A patient has been eating healthy foods, but her respiratory system is not working as well as it usually does. Can this patient still exercise normally?
A. Yes, her body can get everything it needs for energy from molecules in food.
B. No, her respiratory system does not have enough oxygen to combine together to release energy.
C. No, her cells do not have enough oxygen to react with glucose and release energy.
D. No, her cells do not have enough oxygen to react with proteins to release energy.
Answer:
b
Explanation:
Answer:9.b
10.d
11.b
12.b
Explanation:
How did the lab activities help you answer the lesson question: How are relative and absolute dating methods used to determine the age of rocks and fossils? What did you learn from conducting this lab?
(NO SAMPLE ANSWERS!)
Answer:
Relative Dating with Fossils: Index Fossils as Indicators of Time
Explanation:
Answer:
thats cool
Explanation:
Do you feel like reading today -3-
A student found a grasshopper in their backyard and wanted to take it to school to show the teacher the next day. The student put the grasshopper in a sealed container overnight to keep it from hopping away. When the student opened the container the following day, the grasshopper was dead. Which best describes what organelle in the grasshopper’s cells was unable to perform properly for the grasshopper to stay alive as a result of being kept in a sealed container overnight?
A.The mitochondria were unable to undergo cellular respiration and could not produce energy for the cells to function.
B.The lysosomes were unable to remove waste from the cells
C.The cell membrane was unable to allow substances to enter and exit the cells.
D.The nucleus was unable to provide instructions for the other organelles in the cells.
PLZZ HELP!
the organism in the image is a free-living one that is anchored to the bottom of ponds and streams
what is the common name of the group to which this organism belongs?
A. CNIDARAINS
B. FLATWORMS
C. ANNELIDS
D. PORIFERA
The common name of the group to which the organism belongs to cnidarians.
Who are cnidarians?Cnidaria is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.
Moreover, cnidarians have a unique feature: stinging cells called cnidocytes (NID-uh-sites). Each cnidocyte cell has a long, coiled, tubular harpoon-like structure.
Hence, the phylum Cnidaria is made up of four classes: Hydrozoa (hydrozoans); Scyphozoa (scyphozoans); Anthozoa (anthozoans); and Cubozoa (cubozoans).
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How does something become a limiting factor?
Images A and B below represent two different slide preparations of elodea leaves.
Elodea is a plant found in streams and ponds that normally contains 1% salt and 99% water.
Model A: Elodea leaf mounted in solution of 1% salt and 99% water
Model B: Elodea Leaf mounted in a Solution of 6% salt and 94% water.
Five minutes after the slides were prepared, a student using a compound light microscope to observe the cells in leaves A and B would most likely see which of the following?
A. Water moved into the cells of the leaf on slide A, causing the cells to swell.
B. Water moved out of the cells of the leaf on slide A, causing the cells to shrink.
C. Water moved out of the cells of the leaf on slide B, causing the cells to shrink.
D. Water moved into the cells of the leaf on slide B, causing the cells to swell.
What other ways can organisms be classified? (20 points!!)
Answer:
Here:
Explanation:
1. Physiological Structures: grouped organisms by their modes of transportation: swimming, walking, flying, etc.
2. Embryology and Ontogeny: development and changes that an embryo goes through as it changes from the fertilized egg to the organisms’ mature form.
3. Phylogenetic Relationships: history of a species or group of related species.