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
#19 is B. Sorry I'm only certain about one question. :P
Thats alright. You're sure? Thank You
-MC
Oh! Sorry! I read the answers wrong. I think it's A. Mitochondria produce ATP, not use it.
I know its been a long time since this question was posted but 19 is a.. although you probably already know this by now.. I think I'm taking this exact same class this summer lol
17. To determine the correct answer for question 17, let's go through each option and see if they are functions of the nucleus:
a. Directing the function of the cell: The nucleus contains the genetic material (DNA) of the cell, which provides instructions for the cell's functions. So, this is a valid function of the nucleus.
b. Partial assembly of ribosomes: The assembly of ribosomes occurs in a specialized region of the nucleus called the nucleolus. So, this is also a function of the nucleus.
c. Storing most of the hereditary information of the cell: The nucleus houses the DNA, which contains the hereditary information of the cell. Therefore, this is an additional function of the nucleus.
From the above analysis, we can conclude that all of the above functions (a, b, and c) are carried out by the nucleus. Therefore, the correct answer is d. All of the above.
18. Now, let's determine the correct answer for question 18 by examining each option:
a. Anchor ribosomes in place: Internal membranes, specifically the endoplasmic reticulum (ER), serve as the site for the attachment of ribosomes, allowing them to synthesize proteins. This is a valid role of internal membranes.
b. Transport substances to different areas: Internal membranes, such as those of the ER and Golgi apparatus, are involved in the transportation of substances within the cell. This includes the movement of proteins to different areas. Therefore, this is a valid role.
c. Contain the hereditary information for the protein: The hereditary information for proteins is stored in the DNA located in the nucleus, not in the internal membranes. Therefore, this statement is NOT a valid role.
d. Modify proteins to go into vesicles: Internal membranes, particularly the Golgi apparatus, play a crucial role in modifying and packaging proteins into vesicles for transport. This is a valid role of internal membranes.
Based on the analysis, the option that does NOT represent an important role of internal membranes is c. Contain the hereditary information for the protein.
19. Let's evaluate each option to determine the correct answer for question 19:
a. It is where most of the organism's ATP is used: Mitochondria are known as the powerhouse of the cell since they generate the majority of the cell's ATP (energy currency). Therefore, this statement is true.
b. They have their own DNA: Mitochondria do indeed have their own small circular DNA molecules, distinct from the nuclear DNA. So, this statement is true.
c. Muscle cells have many mitochondria: Muscles require significant amounts of energy, so they have a high concentration of mitochondria to meet this demand. Therefore, this statement is also true.
d. The inner membrane has a large surface area: The inner mitochondrial membrane possesses numerous folds called cristae, increasing the surface area available for energy production. So, this statement is true.
Based on the analysis, the option that is NOT true about mitochondria is a. It is where most of the organism's ATP is used.
20. Let's evaluate each option to determine the correct flow of energy through a living system:
a. Sunlight, volcanic vent, prokaryote: Sunlight is the primary source of energy for most living organisms. However, volcanic vents and prokaryotes do not play a role in the flow of energy through a typical living system. This option is incorrect.
b. Sunlight, grass, caribou: Sunlight is transformed by photosynthesis in plants, such as grass, into chemical energy. Caribou consume the grass, obtaining the stored energy. This reflects a valid flow of energy in a living system, making this option correct.
c. Plankton, sunlight, whale: Sunlight is transformed into chemical energy by photosynthetic plankton. The whale then consumes the plankton, obtaining the stored energy. This represents a valid flow of energy in a living system, so this option is correct.
d. Grass, mouse, rabbit: Grass stores chemical energy obtained from sunlight through photosynthesis. A mouse consumes the grass, gaining the stored energy. Similarly, a rabbit consumes the grass or other plant material. This reflects a valid energy flow in a living system, making this option correct as well.
Therefore, the correct answer for question 20 is b. Sunlight, grass, caribou.
I hope this helps! Let me know if you have any further questions.