The eukaryotic organelle that is directly involved in the transport of proteins synthesized on the surface of the rough ER is called the:
A. smooth ER.
B. vacuole.
C. mitochondrion.
D. Golgi body.
E. nucleus.
Answer: D
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Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
In prokaryotes, the 30S pre-rRNA transcript is cleaved into:
A. two rRNAs. B. three RNAs. C. two rRNAs and tRNA. D. three RNAs and tRNA. E. multiple copies of three specific RNAs plus tRNA.
True or False: Gene therapy has been used for years to treat or cure sickle-cell disease.
Answer the following statement true (T) or false (F)
Why is it important that humans attempt to control their numbers and begin to identify renewable resources?
What will be an ideal response?