Base sequence on messenger RNA that aids its transport across the nuclear envelope
(A) Nonsense codon
(B) Anticodon
(C) Ribosome
(D) Exon
(E) Poly-A tail
Answer: (E) Poly-A tail
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What did experiments with the brown alga Fucus help to determine?
A. The cytoplasm is evenly distributed throughout the algal zygote. B. The thallus anchors the alga to the surface on which it lives. C. Light and gravity do not affect rhizoid orientation. D. Magnesium gradients are important for cell wall formation. E. A cell wall is required for the zygote to "remember" where a rhizoid should form.
The 16-kb mitochondrial genome encodes 13 proteins. How can there be more than 13 mitochondrially inherited conditions?
A) Some conditions are due to nuclear genes. B) Many of the conditions are due to translation errors. C) There are different kinds and numbers of mutations per gene. D) Each parent may contribute different mutations. E) Exon shuffling allows different polypeptides to form.
Where does the citric acid cycle take place?
What will be an ideal response?
Class II MHC genes code for
A. certain secreted complement components. B. all HLA antigens. C. self receptors recognized by natural killer cells. D. receptors located primarily on macrophages, dendritic cells, and B cells. E. All of these choices are correct.