Which adaptation to the plasma membrane allows mammals to hibernate in subzero temperatures without their plasma
membranes freezing?
a. increase in cholesterol content only
b. increase in protein content only
c. increase in the number of double covalent bonds in phospholipids
d. increase in both cholesterol and protein content
e. increase in both cholesterol and double covalent bonds in phospholipids
ANSWER: e
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Live-bearing reproduction, or viviparity, has apparently evolved ____
a. just three separate times b. about 200 separate times in vertebrates alone c. only in mammals d. only once, although many groups lost it secondarily e. about 15 separate times
Which of the following is a true statement about cycads?
a. Cycads can be pollinated by beetles. b. Cycads are the most common gymnosperm. c. Cycad leaves are a source of ephedrine. d. Cycads have only one surviving species.
The translocation process requires:a
no additional energy. b. activation of the P site. c. the input of two ATP molecules to supply the needed energy. d. energy supplied by GTP. e. phosphorylation of the mRNA molecule
When a eukaryotic gene is cloned into a bacterium, the advantage of a complementary DNA (cDNA) gene being used instead of fragments of genomic DNA is that ________.
A. the introns have been removed from the cDNA gene but not from the genomic fragment B. There is no advantage to using a cDNA gene rather than a genomic fragment C. the cDNA is made with the nucleotides found in the prokaryote but not in the eukaryote D. the promoter and terminator are found in the cDNA gene but not in the genomic fragment