Which of the following is not a terminal electron acceptor in anaerobic respirations?

a)nitrite
b)carbon dioxide
c)hydrogen sulfide
d)sulfate
e)nitrate

Question 2

Which of the following is not an end product of fermentation?

a)pyruvate
b)none of the answers are correct
c)butanol
d)carbon dioxide
e)acetone

Question 3

Chorismate is used in a branched pathway to synthesize

a)polyketide antibiotics.
b)fatty acids.
c)purines and pyrimidines.
d)tetrapyrroles.
e)aromatic amino acids.

Question 4

Hydrolysis of ATP with the release of pyrophosphate is the driving force of which of the following reactions?

a)only RNA and DNA synthesis
b)all of the answers are true
c)RNA synthesis
d)DNA synthesis
e)aminoacylation of tRNA

Question 5

The acetyl-group of acetyl-CoA condenses with oxaloacetate to form citrate, a component in the TCA cycle that contains how many carbons?

a)2
b)5
c)4
d)6
e)3

I only think the first one is HS. I have no clue and can't find the answers to these in my book. Can I get some help. Thank You

A, B, C, D, E

1. Sulphate

Sure, I'd be happy to help! Let's go through the questions one by one:

Question 1: Which of the following is not a terminal electron acceptor in anaerobic respirations?
Well, I guess someone forgot to invite carbon dioxide to the anaerobic respiration party! So, the answer here is b) carbon dioxide.

Question 2: Which of the following is not an end product of fermentation?
Fermentation is like a little chemistry experiment brewed by the cells, and it creates some interesting concoctions. But if we're looking for something that fermentation does not create, we can eliminate a) pyruvate, c) butanol, d) carbon dioxide, and e) acetone. So the answer here is b) none of the answers are correct. Fermentation is quite the versatile process!

Question 3: Chorismate is used in a branched pathway to synthesize what?
Ah, the magical chorismate molecule! It must be quite a special ingredient if it's used in a branched pathway. Well, let's see what it's used for. Polyketide antibiotics? Nope. Fatty acids? Nah. Purines and pyrimidines? Nope. Tetrapyrroles? Not quite. So that leaves us with e) aromatic amino acids. It seems like chorismate is the secret ingredient in the recipe for these flavorful amino acids!

Question 4: Hydrolysis of ATP with the release of pyrophosphate is the driving force of which of the following reactions?
Ah, ATP, the energy currency of the cell. It's like the cell's version of a cash dispenser. So, what does the hydrolysis of ATP power? Well, it definitely powers d) DNA synthesis and c) RNA synthesis. And hey, it even powers the aminoacylation of tRNA (that's like giving tRNA a fancy makeover!). So the answer here is b) all of the answers are true. ATP really knows how to get things done!

Question 5: The acetyl-group of acetyl-CoA condenses with oxaloacetate to form citrate, a component in the TCA cycle that contains how many carbons?
Ah, the TCA cycle, also known as the tricarboxylic acid cycle or the Krebs cycle. It's like a never-ending carousel ride for carbon atoms! So, how many carbons are cozying up together in citrate? Let's count them. Hmm, it looks like citrate contains a total of d) six carbons. That's quite a carbon-filled cycle!

So there you have it! I hope my answers gave you a good laugh and helped you out. If you have any more questions or need further clarification, feel free to ask!

Of course! I would be happy to help you with these questions. Let's go through each question and I'll explain how to find the correct answers.

Question 1:
To determine the terminal electron acceptor in anaerobic respiration, we can look at the different options provided. The terminal electron acceptor is the final electron acceptor in the electron transport chain. In anaerobic respiration, organisms use alternative electron acceptors other than molecular oxygen (O2).

a) Nitrite can be a terminal electron acceptor in some anaerobic respiration processes, so it is not the correct answer.
b) Carbon dioxide is not typically a terminal electron acceptor in anaerobic respiration, so it could be a possible answer.
c) Hydrogen sulfide can be a terminal electron acceptor in some anaerobic respiration processes, so it is not the correct answer.
d) Sulfate can be a terminal electron acceptor in some anaerobic respiration processes, so it is not the correct answer.
e) Nitrate can be a terminal electron acceptor in some anaerobic respiration processes, so it is not the correct answer.

Based on this information, we can conclude that the answer is b) carbon dioxide.

Question 2:
To determine the end product of fermentation, we need to know the process and the products it produces. Fermentation is an anaerobic process in which organic compounds, like glucose, are partially oxidized. This process does not require an external electron acceptor like oxygen.

a) Pyruvate is an intermediate product of fermentation, so it is not the correct answer.
b) None of the answers are correct, indicating that the fermentation process does not produce any of the options given.
c) Butanol can be a product of fermentation, so it is not the correct answer.
d) Carbon dioxide is a product of fermentation in certain pathways, so it is not the correct answer.
e) Acetone can be a product of fermentation, so it is not the correct answer.

Therefore, the answer is b) none of the answers are correct.

Question 3:
To determine what chorismate is used to synthesize, we need to know the metabolic pathways and products involved.

a) Polyketide antibiotics are synthesized through a different pathway, so this is not the correct answer.
b) Fatty acids are synthesized through a different pathway, so this is not the correct answer.
c) Purines and pyrimidines are synthesized through a separate pathway, so this is not the correct answer.
d) Tetrapyrroles are synthesized through a different pathway, so this is not the correct answer.
e) Aromatic amino acids can be synthesized from chorismate.

Based on this information, the answer is e) aromatic amino acids.

Question 4:
To determine which reaction is driven by the hydrolysis of ATP with the release of pyrophosphate, we need to examine the options given.

a) RNA synthesis can be driven by the hydrolysis of ATP, so this is not the correct answer.
b) All of the answers can be true in certain contexts, so this is a possible answer.
c) RNA synthesis can be driven by the hydrolysis of ATP, so this is not the correct answer.
d) DNA synthesis can be driven by the hydrolysis of ATP, so this is not the correct answer.
e) Aminoacylation of tRNA can be driven by the hydrolysis of ATP, so this is not the correct answer.

Based on this information, the answer is b) all of the answers are true.

Question 5:
To determine the number of carbons in citrate, we need to know the precursor and the number of carbons it contains.

The precursor for citrate synthesis is acetyl-CoA, which is a two-carbon molecule.

a) 2 is the number of carbons in acetyl-CoA, not citrate, so this is not the correct answer.
b) 5 is not the number of carbons in citrate, so this is not the correct answer.
c) 4 is not the number of carbons in citrate, so this is not the correct answer.
d) 6 is the correct number of carbons in citrate, so this could be the correct answer.
e) 3 is not the number of carbons in citrate, so this is not the correct answer.

Based on this information, the answer is d) 6.

I hope this explanation helps you understand how to approach these questions and arrive at the correct answers.