DNA, RNA, and Proteins

Help Questions

AP Biology › DNA, RNA, and Proteins

Questions 1 - 10
1

The lac operon is an inducible operon. Which of the following best describes this type of operon?

The operon is usually off and has an active repressor

The operon is usually off and has an inactive repressor

The operon is usually on and has an active repressor

The operon is usually on and has an inactive repressor

None of these

Explanation

With an inducible system, the operon is off, meaning its repressor is active, or actively repressing the system from turning on. Inducible operons are opposite to a repressible operon, which is always on until it is repressed.

2

The lac operon is an inducible operon. Which of the following best describes this type of operon?

The operon is usually off and has an active repressor

The operon is usually off and has an inactive repressor

The operon is usually on and has an active repressor

The operon is usually on and has an inactive repressor

None of these

Explanation

With an inducible system, the operon is off, meaning its repressor is active, or actively repressing the system from turning on. Inducible operons are opposite to a repressible operon, which is always on until it is repressed.

3

The lac operon is an inducible operon. Which of the following best describes this type of operon?

The operon is usually off and has an active repressor

The operon is usually off and has an inactive repressor

The operon is usually on and has an active repressor

The operon is usually on and has an inactive repressor

None of these

Explanation

With an inducible system, the operon is off, meaning its repressor is active, or actively repressing the system from turning on. Inducible operons are opposite to a repressible operon, which is always on until it is repressed.

4

Which is an example of a biological catalyst that is not a protein?

Ribozymes

Spliceosomes

Transferases

Hydrolases

Lyases

Explanation

This question ultimately hinges on knowing the difference between ribozymes and spliceosomes because transferase, hydrolase, and lyase should all be recognized as proteins that function as enzymes. Transferase catalyzes reactions that facilitate the transfer of functional groups. Hydrolase works to catalyze hydrolysis reactions. Lyase works to catalyze reactions that break down double bonds. Spliceosomes are a unit of proteins and RNA that work to catalyze reactions that splice out introns in RNA to form mature mRNA ready for translation. Ribozymes are important because they also splice RNA into mRNA, but they do not have a protein component to them. The discovery of Ribozymes was a breakthrough in that it was the first evidence that not all enzymes are proteins.

5

The lac operon is an inducible operon. Which of the following best describes this type of operon?

The operon is usually off and has an active repressor

The operon is usually off and has an inactive repressor

The operon is usually on and has an active repressor

The operon is usually on and has an inactive repressor

None of these

Explanation

With an inducible system, the operon is off, meaning its repressor is active, or actively repressing the system from turning on. Inducible operons are opposite to a repressible operon, which is always on until it is repressed.

6

Which is an example of a biological catalyst that is not a protein?

Ribozymes

Spliceosomes

Transferases

Hydrolases

Lyases

Explanation

This question ultimately hinges on knowing the difference between ribozymes and spliceosomes because transferase, hydrolase, and lyase should all be recognized as proteins that function as enzymes. Transferase catalyzes reactions that facilitate the transfer of functional groups. Hydrolase works to catalyze hydrolysis reactions. Lyase works to catalyze reactions that break down double bonds. Spliceosomes are a unit of proteins and RNA that work to catalyze reactions that splice out introns in RNA to form mature mRNA ready for translation. Ribozymes are important because they also splice RNA into mRNA, but they do not have a protein component to them. The discovery of Ribozymes was a breakthrough in that it was the first evidence that not all enzymes are proteins.

7

Which is an example of a biological catalyst that is not a protein?

Ribozymes

Spliceosomes

Transferases

Hydrolases

Lyases

Explanation

This question ultimately hinges on knowing the difference between ribozymes and spliceosomes because transferase, hydrolase, and lyase should all be recognized as proteins that function as enzymes. Transferase catalyzes reactions that facilitate the transfer of functional groups. Hydrolase works to catalyze hydrolysis reactions. Lyase works to catalyze reactions that break down double bonds. Spliceosomes are a unit of proteins and RNA that work to catalyze reactions that splice out introns in RNA to form mature mRNA ready for translation. Ribozymes are important because they also splice RNA into mRNA, but they do not have a protein component to them. The discovery of Ribozymes was a breakthrough in that it was the first evidence that not all enzymes are proteins.

8

Disulfide bonds can add stability to the structure of a protein. The formation of disulfide bonds occurs in the formation of what level of protein structure?

Tertiary

Primary

Secondary

Quaternary

During translation

Explanation

The correct answer is "tertiary." Translation is a process performed by ribosomes to link amino acids together in a chain, and the order of the amino acids is based on a code from mRNA. The order of the amino acids in the chain is the primary structure. The secondary structure is the folding in that chain, mainly based on hydrogen bonds between parts of the chain and the surrounding water molecules. The tertiary structure is the actual three-dimensional structure of the protein. Disulfide bonds are covalent bonds between cysteine residues and are stronger than hydrogen bonds and give a stable, three-dimensional structure to what was originally just a chain of amino acids.

9

Which is an example of a biological catalyst that is not a protein?

Ribozymes

Spliceosomes

Transferases

Hydrolases

Lyases

Explanation

This question ultimately hinges on knowing the difference between ribozymes and spliceosomes because transferase, hydrolase, and lyase should all be recognized as proteins that function as enzymes. Transferase catalyzes reactions that facilitate the transfer of functional groups. Hydrolase works to catalyze hydrolysis reactions. Lyase works to catalyze reactions that break down double bonds. Spliceosomes are a unit of proteins and RNA that work to catalyze reactions that splice out introns in RNA to form mature mRNA ready for translation. Ribozymes are important because they also splice RNA into mRNA, but they do not have a protein component to them. The discovery of Ribozymes was a breakthrough in that it was the first evidence that not all enzymes are proteins.

10

Which is an example of a biological catalyst that is not a protein?

Ribozymes

Spliceosomes

Transferases

Hydrolases

Lyases

Explanation

This question ultimately hinges on knowing the difference between ribozymes and spliceosomes because transferase, hydrolase, and lyase should all be recognized as proteins that function as enzymes. Transferase catalyzes reactions that facilitate the transfer of functional groups. Hydrolase works to catalyze hydrolysis reactions. Lyase works to catalyze reactions that break down double bonds. Spliceosomes are a unit of proteins and RNA that work to catalyze reactions that splice out introns in RNA to form mature mRNA ready for translation. Ribozymes are important because they also splice RNA into mRNA, but they do not have a protein component to them. The discovery of Ribozymes was a breakthrough in that it was the first evidence that not all enzymes are proteins.

Page 1 of 77