Genes that are expressed only when needed are
A) unregulated.
B) mutations.
C) inducible.
D) constitutive.
E) anabolic.
Answer: C
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Lymphocytes mature in the _____
I) spleen II) thymus III) bone marrow A) only I and III B) only I and II C) only II and III D) I, II, and III
Which of the following is not true of the regulation of translation initiation in eukaryotes?
A. Repressors bind to the 3' untranslated region of mRNA. B. Repressors bind to initiation factors. C. Repressors bind to translational start sites of mRNA. D. Repressors bind to translational release factors.
Autosomal monosomy is not seen in live births because:a
its effects are so small as to be overlooked. b. its effects do not set in until adulthood. c. its effects are so lethal as to cause spontaneous abortion early in pregnancy. d. it only occurs in sex chromosomes and therefore does affect nonreproductive function. e. they lead to the establishment of a clone of abnormal cells
The hypothesis that explains the origin of eukaryotic cells as the result of two or more simpler cells developing a relationship with one another is called:
A) symbiosis B) evolution theory C) endosymbiont theory D) panspermia