The algal ancestors of land plants are most likely similar to the ____
a. Rhodophyta
b. Phaeophyta
c. Chrysophyta
d. Charophyta
e. Radiolaria
ANSWER: d
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Which of the following defines recombination frequency?
a. the average number of duplicate alleles in a chromosome b. the occurrence rate of a trait in the next generation c. the average number of crossovers between two alleles d. the number of generations between expressed recessive traits
What of the following is not associated with an El Nino event? a. Decline in marine primary producers
b. Decrease in the nutrients along the eastern Pacific coasts. c. Warm currents replace cold currents. d. Decline in the anchovy population. e. Increase in sea lion populations.
The main force that moves blood throughout the system of blood vessels is
a. arterial blood pressure. b. skeletal muscle action. c. smooth muscle action. d. valve action. e. venous blood pressure.
During exhalation, the pressure inside the lungs
A) initially is higher than atmospheric pressure, but drops as air leaves the body. B) must be maintained higher than atmospheric pressure. C) must be maintained lower than atmospheric pressure. D) gradually elevates as air enters the lungs. E) rapidly elevates.