Arrange the steps involved in swallowing in chronological order, with the earliest step first.
A) voluntary ingestion of food
B) food enters the esophagus
C) food enters the pharynx
D) the epiglottis covers the glottis
voluntary ingestion of food, food enters the pharynx, the epiglottis covers the glottis, food enters the esophagus
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Which organelles make and store pigments other than chlorophylls?
a. plastids b. chloroplasts c. chromoplasts d. central vacuoles e. vesicles
The components of a nucleotide are
A) a carboxyl group, an amine group, and a variable R group. B) a five-carbon sugar, a phosphate group, and a nitrogen-containing aromatic base. C) a three-carbon alcohol with a hydroxyl group on each carbon and three fatty acids. D) two six-carbon sugars attached with an ?(1?4) glycosidic bond. E) a six-carbon sugar, an ester linkage, and a four-ringed hydrocarbon.
An individual can safely engage in anal intercourse
a) without a condom if the partner is negative for all sexually transmitted infections (STIs). b) without a condom if the partner has cleaned the anus and anal canal, using an enema. c) with a latex condom regardless of the partner's STI status. d) with a latex condom and baby oil for lubrication regardless of the partner's STI status.
A YAC is
a. a vector for cloning genes into yeast cells. b. a Yeast Activating Complex for inducing expression of genes. c. a sequence that allows selection of successfully transformed bacteria. d. a technique for separating DNA fragments according to size. e. a type of DNA polymerase used in PCR.