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.
B
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In eukaryotic cells, the oxidation of pyruvate occurs in:
A. the cytoplasm. B. the nucleus. C. the matrix of the mitochondria. D. the endoplasmic reticulum. E. vacuoles.
When constructing a YAC, why must a large DNA insert be included?
A) The inserted DNA base pairs with DNA in the genome. B) YACs that are too small do not segregate properly during mitosis. C) The inserted DNA functions as telomeres. D) The inserted DNA contains origins of replication needed for maintenance of the YAC. E) The inserted DNA allows YACs to be used in both eukaryotic and prokaryotic cells.
A dispersion pattern refers to ________
A) the density of organisms in a habitat B) the extinction rates of a species C) the spacing of organism throughout a habitat D) the diversity of species found in a habitat
Which of the following, if missing, would usually prevent translation from starting in eukaryotes?
A) 5' cap B) 5' cap or AUG codon C) Exon, 5' cap, or AUG codon D) AUG codon E) Exon