1) What localization occurs for proteins that are normally nuclear when their nu

Question

1) What localization occurs for proteins that are normally nuclear when their nuclear localization signal is deleted and the protein is injected into the cytoplasm of cultured cells?
a. Nucleus
b. Cytoplasm
c. In a ring around the outside of the nuclear envelope
d. Extracellular

2) Transport of RNAs out of the nucleus involves all but which of the following?
a. Ran
b. Expenditure of chemical energy
c. Protein translocation signals
d. Small RNAs crossing by passive diffusion

3) Ciliated protozoa have a transcriptionally
a. active nucleus that participates in sexual reproduction.
b. inactive nucleus that participates in sexual reproduction.
c. inactive nucleus that participates in sexual reproduction and a transcriptionally active nucleus that does not participate in sexual reproduction.
d. active nucleus that participates in sexual reproduction and a transcriptionally inactive nucleus that does not participate in sexual reproduction.

4) Chromosomes are attached to the nuclear envelope by
a. centromeres.
b. telomeres.
c. origins of replication.
d. nuclear lamin genes.
e. Both a and b

5) Chromatin domains are loops of about _______ base pairs of DNA.
a. 1000
b. 10,000
c. 100,000
d. 1,000,000

Explanation / Answer

1) c. In a ring around the outside of the nuclear envelope

2. d. Small RNAs crossing by passive diffusion

3. c . inactive nucleus that participates in sexual reproduction and a transcriptionally active nucleus that does not participate in sexual reproduction.

4. e. Both a and b

5. b. 10,000

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