1) You would expect to find Ran-GAP in the _________ and Ran GEF in the ________
ID: 277319 • Letter: 1
Question
1) You would expect to find Ran-GAP in the _________ and Ran GEF in the __________
A. cytoplasm, nucleus
B. nucleus, cytoplasm
C. cytoplasm, cytoplasm
D. nucelus, nucleus
2)The following descriptions apply to either mitochondrial import or nuclear import. Choose all the statements that apply to mitochondrial import.
A. The signal sequence is recognized and bound by a receptor protein in the organelle's outer membrane.
B. ATP hydrolysis is required
C. GTP hydrolysis is required
D. Chaperone proeteins are involved
E. The imported protein enters through a pore that is large enough to allow ions and water molecules to traverse freely.
3)In order for growth to occur at both ends of a microtubule..
A.The concentration of subunits must be higher than the critical concentration for the plus end
B.The concentration of subunits must be higher than the critical concentration for both the plus and minus ends
C. The concentration of subunits must be higher than the critical concentration for the plus end but less than the critical concentration for the minus end
4)The energy required for tubular polymerization is provided by the hydrolysis of GTP.
A. TRUE
B. FALSE
5) In cilia, side arms are attached to
A. central pairs
B. a tubules
C. b tubules
D. interdoublet nexins
E. radical spokes
6)Which of the following statements is correct with respect to flagella and cilia?
A. Cilia generate a force parallel to the cell surface.
B. Flagella display an oarlike pattern of beating.
C. There are usually fewer cilia than flagella.
D. Cilia are generally longer than flagella.
E. Cilia have a helical pattern of movement.
7)Muscle contraction occurs in a cyclic process. Which of the following sequences is in the correct order?
A. power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin
B. cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin
C. cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin
D. cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation
E. cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke
Explanation / Answer
The correct answer is option (A).
The localization of the Ran-GAP is in the cytoplasm and the Ran-GEF is in the nucleus. This is necessary for the one-directional import of the cargo proteins. These proteins contain nuclear localization signals. The Ran-GAP is involved in the transport of proteins from the cytosol to the nucleus.
Therefore, Ran-GAP can be expected to be found in the cytoplasm and Ran-GEF is expected to be found in the nucleus.
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