Mammals have two traits that set them apart from all other animals. These are
a. body hair or fur, and being homeothermic.
b. amniotic eggs and milk production.
c. four-chambered heart and milk production.
d. body hair or fur, and milk production.
e. four-chambered heart and body hair or fur.
D
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Explain how, when improper base pairing escapes repair by the proofreading system, cells are able to detect and repair mutations
What will be an ideal response?
The extraembryonic membrane that secretes fluid around the developing embryo is the
a. allantois. b. amnion. c. chorion. d. yolk sac. e. both the allantois and the yolk sac.
Of all the different codons that exist, three of
them
a. are not used in any organisms. b. do not code for an amino acid. c. code for non-functional amino acids. d. signify ‘start here’. e. do more than one of these things.
A diploid cell has how many versions of each gene?
a. 1 b. 2 c. 4 d. 8 e. 16