1 The average amino acid length of proteins in Escherichia coli is 235. Therefore, according to the video, the elongation time for an average E. coli protein would be about _______seconds.
2 How is the small ribosomal unit positioned to allow for translation to start at the proper start codon?Choose one:
A. Shine-Dalgarno sequence
B. The start codon sequence is specifically attracted to the P site.
C. Initiation factors position the mRNA accordingly.
D. The small ribosomal subunit starts at the far 5' end of mRNA where the start codon is located.
3 ABC transporters can be efflux transporters that move molecules such as proteases, lipases, and _______out of the cell.
4 Which of the following directly describes where the name ABC transporters comes from? (It is another name for what the acronym "ABC" means.)
Choose one:
A. They act as influx channels.
B. They have membrane-spanning regions.
C. They act as efflux proteins.
D. They have nucleotide binding domains.
5 Why is ATP hydrolysis required for these transporters to operate properly?
Choose one:
A. because it causes a rotation of the channel to spin the molecule through to the other side of the membrane
B. because it causes a plunger effect to push the molecule through the channel
C. because it causes a conformational change to open the channel to the other side
D. because it causes a hydrophobic change to propel the molecule through the channel
6 Which of the following first interacts with the signal sequence on proteins that are inserted into the membrane?
Choose one:
A. SecA
B. SRP
C. LepB
D. SecYEG translocon
E. FtsY
7 Which of the following functions are associated with SRP?
Choose one or more:
A. targeting proteins for degradation
B. bringing ribosome to FtsY
C. acting as a chaperone
D. bringing ribosome to SecYEG translocon
E. stalling translation until ribosome brought to destination
F. recognizing signal sequence
8 Which of the following characteristics is associated with both the N-terminal signal sequences and the transmembrane-spanning regions of inner membrane proteins?
Choose one:
A. form β
sheet secondary structure
B. 15 amino acids in length
C. hydrophobic amino acids
D. begin with a methionine
1 The average amino acid length of proteins in Escherichia coli is 235. Therefore, according to the video, the elongation time for an average E. coli protein would be about _______seconds.
2 How is the small ribosomal unit positioned to allow for translation to start at the proper start codon?Choose one:
A. Shine-Dalgarno sequence
B. The start codon sequence is specifically attracted to the P site.
C. Initiation factors position the mRNA accordingly.
D. The small ribosomal subunit starts at the far 5' end of mRNA where the start codon is located.
3 ABC transporters can be efflux transporters that move molecules such as proteases, lipases, and _______out of the cell.
4 Which of the following directly describes where the name ABC transporters comes from? (It is another name for what the acronym "ABC" means.)
Choose one:
A. They act as influx channels.
B. They have membrane-spanning regions.
C. They act as efflux proteins.
D. They have nucleotide binding domains.
5 Why is ATP hydrolysis required for these transporters to operate properly?
Choose one:
A. because it causes a rotation of the channel to spin the molecule through to the other side of the membrane
B. because it causes a plunger effect to push the molecule through the channel
C. because it causes a conformational change to open the channel to the other side
D. because it causes a hydrophobic change to propel the molecule through the channel
6 Which of the following first interacts with the signal sequence on proteins that are inserted into the membrane?
Choose one:
A. SecA
B. SRP
C. LepB
D. SecYEG translocon
E. FtsY
7 Which of the following functions are associated with SRP?
Choose one or more:
A. targeting proteins for degradation
B. bringing ribosome to FtsY
C. acting as a chaperone
D. bringing ribosome to SecYEG translocon
E. stalling translation until ribosome brought to destination
F. recognizing signal sequence
8 Which of the following characteristics is associated with both the N-terminal signal sequences and the transmembrane-spanning regions of inner membrane proteins?
Choose one:
A. form β
sheet secondary structure
B. 15 amino acids in length
C. hydrophobic amino acids
D. begin with a methionine
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