17. Functions of the nucleus include
a. directing the function of the cell
b. the partial assembly of ribosomes
c. storing most of the hereditary information of the cell
d. all of the above
D?
18. Internal membrances play important roles in protien production and processing except they do NOT
a. anchor ribosomes in place
b. transport substances to different areas
c. contain the hereditary information for the protein
d. modify proteins to go into vesicles
C?
19. Which of the following is NOT true about mitochondria?
a. It is where most of the organism's ATP is used
b. they have their own DNA
c. Muscle cells have many mitochondria
d. The inner membrane has a large surface area
B?
20. Identify the correct flow of energy through a living system.
a. sunlight, volcanic vent, prokaryote
b. sunlight,grass, caribou
c. plankton, sunlight, whale
d. grass, mouse, rabbit
B?
Thanks
-MC
again, 17: Explain how a nucleus "directs the function of the cell". You cant. I agree the nucleus controls the functions of the cell. Well,I guess I am nitpicking. Go with D.
the others are ok.
Thanks a lot
-MC
For question 17, the correct answer is d. all of the above. To arrive at this answer, we can break down the options:
a. directing the function of the cell - The nucleus contains the genetic material and controls the overall function of the cell through gene expression.
b. the partial assembly of ribosomes - While the nucleus does contain the genetic instructions for ribosome synthesis, the actual assembly of ribosomes primarily occurs in the cytoplasm. So, this function is not solely attributed to the nucleus.
c. storing most of the hereditary information of the cell - This is true. The nucleus holds the majority of an organism's DNA, which contains the hereditary information necessary for cell functions.
Since options a, b, and c are all correct statements about the functions of the nucleus, the correct answer is d. all of the above.
For question 18, the correct answer is c. contain the hereditary information for the protein. To determine this, let's go through the options:
a. anchor ribosomes in place - Internal membranes, such as the endoplasmic reticulum, play a role in anchoring ribosomes in place during protein synthesis. Thus, this statement is true.
b. transport substances to different areas - Internal membranes, like the vesicles and the endoplasmic reticulum, are responsible for transporting substances to different areas of the cell. So, this statement is also true.
c. contain the hereditary information for the protein - This is false. The hereditary information for the protein is stored in the nucleus as DNA, not in the internal membranes.
d. modify proteins to go into vesicles - Internal membranes, specifically the Golgi apparatus, are responsible for modifying and packaging proteins into vesicles for transportation. So, this statement is true.
Since option c is the incorrect one, the correct answer is c.
For question 19, the correct answer is a. It is where most of the organism's ATP is used. Let's review the options:
a. It is where most of the organism's ATP is used - This statement is false. Mitochondria are responsible for producing ATP through cellular respiration, not for using it.
b. they have their own DNA - This statement is true. Mitochondria have their own DNA, separate from the nuclear DNA.
c. Muscle cells have many mitochondria - This statement is true. Muscle cells require a high amount of ATP for contraction, so they contain large numbers of mitochondria.
d. The inner membrane has a large surface area - This statement is true. The inner mitochondrial membrane is highly folded, creating a large surface area for ATP synthesis.
Since option a is the incorrect one, the correct answer is a.
For question 20, the correct answer is c. plankton, sunlight, whale. Let's evaluate the options:
a. sunlight, volcanic vent, prokaryote - This flow does not represent a biological pathway of energy transfer. It includes non-living entities like volcanic vent and does not follow the typical energy flow in a living system.
b. sunlight, grass, caribou - This option represents a correct flow of energy in a living system. Sunlight is captured by plants (grass), which undergo photosynthesis to convert light energy into chemical energy. Caribou consumes the grass for energy transfer.
c. plankton, sunlight, whale - This option also represents a proper flow of energy. Sunlight provides the energy for photosynthesis by plankton, which serves as food for the whale.
d. grass, mouse, rabbit - This option represents a correct flow, but not a primary pathway of energy transfer. Typically, grass is consumed by herbivores (like a mouse) and then predator-prey relationships continue the energy flow.
Since option c accurately represents the flow of energy through a living system, the correct answer is c.
I hope this helps! Let me know if you have any further questions.