Question 1

Binding of the appropriate aminoacyl-tRNA to the A site requires:

Accepted Answer

The binding of aminoacyl-tRNA to the A site of the ribosome during protein synthesis requires energy, which is supplied by GTP.

Question 2

In essentially all organisms, the AUG codon codes for:

Accepted Answer

The AUG codon is universally recognized as the start codon, signaling the initiation of translation and coding for the amino acid methionine.

Question 3

Translocation is the process whereby the __________ moves in order to place the tRNA bound to the growing polypeptide chain in the __________ site, thereby freeing the __________ site for a new aminoacyl-tRNA.

Accepted Answer

During translocation, the ribosome moves along the mRNA, shifting the tRNA bound to the growing polypeptide chain from the A site to the P site, freeing the A site for a new aminoacyl-tRNA.

Question 4

Where is the amino-acid binding site located on the tRNA molecule?

Accepted Answer

The amino-acid binding site is located at the 3' end of the tRNA molecule, where the amino acid is covalently attached.

Question 5

If a human gene mRNA were placed into a cell of yeast, it would be:

Accepted Answer

Yeast cells have the machinery to translate mRNA from other eukaryotes, including humans, into proteins. The human gene mRNA would be translated into the corresponding protein, assuming the yeast cell can properly process the mRNA and the necessary post-translational modifications are not unique to humans.

Question 6

Figure 13-3
Use the figure to answer the corresponding question(s). 
-Refer to Figure 13-3.The transcription process most likely began at the area labeled:

Accepted Answer

The answer of Figure 13-3
Use the figure to answer the...

Question 7

Leader sequences contain signals that:

Accepted Answer

Leader sequences, such as the Shine-Dalgarno sequence in prokaryotes, help position the ribosome correctly on the mRNA for translation initiation.

Question 8

Figure 13-3
Use the figure to answer the corresponding question(s). 
-Refer to Figure 13-3.The component labeled B is:

Accepted Answer

The answer of Figure 13-3
Use the figure to answer the...

Question 9

Figure 13-3
Use the figure to answer the corresponding question(s). 
-The process illustrated in Figure 13-3 is:

Accepted Answer

The process of transcription involves the synthesis of RNA from a DNA template, which is what Figure 13-3 likely illustrates.

Question 10

Figure 13-3
Use the figure to answer the corresponding question(s). 
-The transcript in Figure 13-3 is labeled:

Accepted Answer

The answer of Figure 13-3
Use the figure to answer the...

Question 11

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Accepted Answer

The first nucleotide at the 5' end of a new mRNA chain retains its triphosphate group, which is important for the capping process that occurs after transcription. Subsequent nucleotides lose two of the phosphates during the formation of the phosphodiester bond.

Question 12

Initiation of transcription requires:

Accepted Answer

Transcription requires a promoter sequence, which is a specific region of DNA that signals the start of transcription and is recognized by the transcription machinery. DNA polymerase is involved in DNA replication, not transcription. RNA primers and DNA primers are used in DNA replication, not transcription. Okazaki fragments are also involved in DNA replication, specifically in lagging strand synthesis.

Question 13

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the __________ site to the aminoacyl-tRNA in the __________ site, is thought to be a(n) __________ molecule and not a protein.

Accepted Answer

Peptidyl transferase is an rRNA molecule, part of the ribosome's large subunit, that catalyzes the transfer of the polypeptide chain from the tRNA in the P site to the aminoacyl-tRNA in the A site.

Question 14

Aminoacyl-tRNA synthetases __________ link __________ to their respective tRNA molecules.

Accepted Answer

Aminoacyl-tRNA synthetases covalently link amino acids to their respective tRNA molecules, ensuring that the correct amino acid is attached to the tRNA corresponding to its anticodon.

Question 15

Figure 13-3
Use the figure to answer the corresponding question(s). 
-Which of the following numbered terms represents the correct order of sequences in a prokaryotic mRNA molecule as it was synthesized? 1)
3' trailing sequences
2)
Coding sequences
3)
Leader sequences
4)
Termination signals

Accepted Answer

In prokaryotic mRNA, the sequence begins with leader sequences, followed by coding sequences, then termination signals, and finally 3' trailing sequences.

Question 16

All of the following characteristics of tRNA molecules are true except::

Accepted Answer

tRNA molecules are smaller than rRNA molecules, not larger.

Question 17

Following peptide bond formation between the amino acid in the A site on the ribosome and the growing polypeptide chain, the tRNA in the A site:

Accepted Answer

After peptide bond formation, the tRNA in the A site moves to the P site of the ribosome with the growing polypeptide chain attached to its amino acid. This movement allows the next tRNA with its amino acid to enter the now-vacant A site for subsequent peptide bond formation.

Question 18

Which of the following numbered events represents the correct sequence of events of prokaryotic translation initiation? 1)
Large ribosomal subunit binds to initiation complex
2)
Initiation tRNA binds small ribosomal subunit
3)
Initiation complex binds to ribosome recognition sequence on mRNA

Accepted Answer

In prokaryotic translation initiation, the initiation tRNA first binds to the small ribosomal subunit, then this complex binds to the ribosome recognition sequence on the mRNA, and finally, the large ribosomal subunit binds to form the complete initiation complex.

Question 19

Why is only one strand of DNA transcribed into mRNA?

Accepted Answer

Transcribing both DNA strands would produce different amino acid sequences due to differences in the complimentary base pairing between the two strands. Only one of the strands contains the necessary genetic information to code for a specific protein.

Question 20

Proteins synthesized in bacteria have which of the following at their amino terminal end?

Accepted Answer

Proteins synthesized in bacteria start with an N-formyl-methionine amino acid. This is due to the initiation codon AUG being preceded by a sequence, called the Shine-Dalgarno sequence, that binds to the small ribosomal subunit and positions the initiation codon correctly. The formyl group is added to the amino group of methionine during translation initiation.

Quiz 13: Gene Expression

Binding of the appropriate aminoacyl-tRNA to the A site requires:

In essentially all organisms, the AUG codon codes for:

Translocation is the process whereby the moves in order to place the tRNA bound to the growing polypeptide chain in the site, thereby freeing the __ site for a new aminoacyl-tRNA.

Where is the amino-acid binding site located on the tRNA molecule?

If a human gene mRNA were placed into a cell of yeast, it would be:

Figure 13-3 Use the figure to answer the corresponding question(s) . -Refer to Figure 13-3.The transcription process most likely began at the area labeled:

Leader sequences contain signals that:

Figure 13-3 Use the figure to answer the corresponding question(s) . -Refer to Figure 13-3.The component labeled B is:

Figure 13-3 Use the figure to answer the corresponding question(s) . -The process illustrated in Figure 13-3 is:

Figure 13-3 Use the figure to answer the corresponding question(s) . -The transcript in Figure 13-3 is labeled:

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Initiation of transcription requires:

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the site to the aminoacyl-tRNA in the site, is thought to be a(n) __ molecule and not a protein.

Aminoacyl-tRNA synthetases link to their respective tRNA molecules.

All of the following characteristics of tRNA molecules are true except::

Following peptide bond formation between the amino acid in the A site on the ribosome and the growing polypeptide chain, the tRNA in the A site:

Which of the following numbered events represents the correct sequence of events of prokaryotic translation initiation? 1) Large ribosomal subunit binds to initiation complex 2) Initiation tRNA binds small ribosomal subunit 3) Initiation complex binds to ribosome recognition sequence on mRNA

Why is only one strand of DNA transcribed into mRNA?

Proteins synthesized in bacteria have which of the following at their amino terminal end?

Quiz 13: Gene Expression

Binding of the appropriate aminoacyl-tRNA to the A site requires:

In essentially all organisms, the AUG codon codes for:

Translocation is the process whereby the __________ moves in order to place the tRNA bound to the growing polypeptide chain in the __________ site, thereby freeing the __________ site for a new aminoacyl-tRNA.

Where is the amino-acid binding site located on the tRNA molecule?

If a human gene mRNA were placed into a cell of yeast, it would be:

Figure 13-3 Use the figure to answer the corresponding question(s) . -Refer to Figure 13-3.The transcription process most likely began at the area labeled:

Leader sequences contain signals that:

Figure 13-3 Use the figure to answer the corresponding question(s) . -Refer to Figure 13-3.The component labeled B is:

Figure 13-3 Use the figure to answer the corresponding question(s) . -The process illustrated in Figure 13-3 is:

Figure 13-3 Use the figure to answer the corresponding question(s) . -The transcript in Figure 13-3 is labeled:

How does the first nucleotide at the 5' end of a new mRNA chain differ from the other nucleotides in the chain?

Initiation of transcription requires:

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the __________ site to the aminoacyl-tRNA in the __________ site, is thought to be a(n) __________ molecule and not a protein.

Aminoacyl-tRNA synthetases __________ link __________ to their respective tRNA molecules.

Figure 13-3 Use the figure to answer the corresponding question(s) . -Which of the following numbered terms represents the correct order of sequences in a prokaryotic mRNA molecule as it was synthesized? 1) 3' trailing sequences 2) Coding sequences 3) Leader sequences 4) Termination signals

All of the following characteristics of tRNA molecules are true except::

Following peptide bond formation between the amino acid in the A site on the ribosome and the growing polypeptide chain, the tRNA in the A site:

Which of the following numbered events represents the correct sequence of events of prokaryotic translation initiation? 1) Large ribosomal subunit binds to initiation complex 2) Initiation tRNA binds small ribosomal subunit 3) Initiation complex binds to ribosome recognition sequence on mRNA

Why is only one strand of DNA transcribed into mRNA?

Proteins synthesized in bacteria have which of the following at their amino terminal end?

Translocation is the process whereby the moves in order to place the tRNA bound to the growing polypeptide chain in the site, thereby freeing the __ site for a new aminoacyl-tRNA.

The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the tRNA in the site to the aminoacyl-tRNA in the site, is thought to be a(n) __ molecule and not a protein.

Aminoacyl-tRNA synthetases link to their respective tRNA molecules.