An erection of the penis results most directly from:a
the bone present in the penis.
b. dilation of the veins leading from the penis.
c. contraction of the muscles within the penis.
d. dilation of the arteries in the penis.
e. a blocking of enzymes within the penis.
D
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In ____, the parent separates into two or more offspring of approximately the same size
a. fission b. fertilization c. fragmentation d. budding e. parthenogenesis
Which statement is NOT true?
a. Migration leads to genetic variation. b. Dominant genes always occur more frequently in a population than recessive genes. c. Nonrandom mating may result in changes in gene frequency. d. The Hardy-Weinberg law applies to large, stable populations. e. Crossing over increases variation.
Fire in the dry shrublands does not kill the small
bushy plants most probably because a. these plants have a tough protective bark. b. their leaves are very heavy and wet. c. they can resprout from root crowns. d. the Forest Service puts the fires out quickly. e. the fires burn the taller plants and burn out before reaching ground level.
The walls of the proximal convoluted tubule (select all correct choices):
A. are composed of epithelial cells with microvilli on their surfaces. B. possess numerous mitochondria. C. use facilitated diffusion to reabsorb glucose and amino acids. D. are where electrolytes are reabsorbed into the blood. E. have a brush border which increases the surface area of the tubule.