A. not dependent of the linear sequence of amino acids. B. not important for the

Question

A. not dependent of the linear sequence of amino acids.

B. not important for the function of the protein.

C. determined by the gene encoding that protein.

D. not influenced by posttranslational modifications.

A. binding to a variety of different –10 and –35 sequences.

B. allowing for binding of various enhancer proteins to aid initiation.

C. using alternate nucleotides to promote different genes.

D. bringing about an early termination due to hairpins in the message.

3.The maltose-binding protein (MBP) of Escherichia coli is a periplasmic protein made of 370 amino acids that is secreted through SecYEG. SecA would use______

ATP molecules to assist with translocation of MBP.

A.18

B.19

C.20

4.Why is ATP hydrolysis required for these transporters to operate properly?

Choose one:

A. because it causes a conformational change to open the channel to the other side

B. because it causes a plunger effect to push the molecule through the channel

C. because it causes a hydrophobic change to propel the molecule through the channel

D. because it causes a rotation of the channel to spin the molecule through to the other side of the membrane

Explanation / Answer

1.The final three-dimensional shape of a protein is

ANSWER IS: C. determined by the gene encoding that protein.

EXPLANATION :

The final three-dimensional shape of a protein is determined by its amino acid sequence and drives the folding and intramolecular bonding of the linear amino acid chain that ultimately determines the protein three-dimensional shape.
This 3D shape is important for the function of the protein which is influenced by posttranslational modifications.


2. Various sigma factors play a role in gene expression by

ANSWER IS: A. binding to a variety of different –10 and –35 sequences.

EXPLANATION:

Sigma (?) factors control the promoter selectivity of bacterial RNA polymerase ( RNAP) by binding to 10 and 35 bases upstream of the transcription.

3.The maltose-binding protein (MBP) of Escherichia coli is a periplasmic protein made of 370 amino acids that is secreted through SecYEG. SecA would use______ ATP molecules to assist with translocation of MBP.

A.18

B.19

C.20

4.Why is ATP hydrolysis required for these transporters to operate properly?

ANSWER IS: A. because it causes a conformational change to open the channel to the other side

EXPLANATION:
ATP hydrolysis required for transporters to operate properly as conformational changes enable proteins to drive directed movements of cells and their components and open the channel to the other side

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