Which of the following are components of a phospholipid?
a. a molecule of glycerol
b. a phosphate molecule
c. two fatty acid chains
d. all of the above
d
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Body cells of human females contain _____
a. one X chromosome b. two X chromosomes c. one Y chromosomes d. two Y chromosomes e. one X and one Y chromosome
The place where sound waves are translated into
patterns of nerve impulses is a. the pinna. b. the auditory canal. c. the middle ear. d. the organ of Corti. e. none of these.
How does transformation differ from conjugation?
A) Transformation takes up DNA from the environment. B) Transformation requires only fresh DNA be used. C) Transformation involves a pilus. D) Transformation can only exchange DNA between bacteria of the same species. E) Transformation requires DNA to be on a plasmid.
How are most eukaryotic transcription regulators able to affect transcription when their binding sites are far from the promoter?
(a) by binding to their binding site and sliding to the site of RNA polymerase assembly (b) by looping out the intervening DNA between their binding site and the promoter (c) by unwinding the DNA between their binding site and the promoter (d) by attracting RNA polymerase and modifying it before it can bind to the promoter