Plasmids are ____
a. enzymes that cut DNA
b. RNA molecules
c. small proteins that help replicate cloned genes
d. protein-coding genes in the chromosome
e. circular DNA molecules that replicate separately from chromosomal DNA
ANSWER: e
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A netlike array of leaf veins is typical of ________
a. either monocots or eudicots b. monocots only c. eudicots only d. neither monocots nor eudicots
An animal whose body temperature tends to fluctuate with the external environment is an
A. thermophile. B. mesophile. C. amniote. D. endotherm. E. ectotherm.
The polypeptide-making organelles, which consist of protein combined with RNA, are called
A. centrosomes. B. Golgi bodies. C. mitochondria. D. ribosomes. E. lysosomes.
In a study on human mate choice, researchers found that daughters choose mates who look like their fathers. To determine whether daughters choose mates who are genetically similar to them, the mate choices of adopted daughters were analyzed. Independent
judges determined that adopted daughters chose mates with facial similarities to their adoptive father. This influence of parental image on mate choice could be considered a human example of A) imprinting. B) habituation. C) pattern recognition. D) a dominance hierarchy.