Which of the following sex and generation combinations directly produces the pollen tube of angiosperms?
A) male gametophyte
B) female gametophyte
C) male sporophyte
D) female sporophyte
E) bisexual gametophyte
Answer: A
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Which of the following is an example of how natural selection is responsible for the variation seen in the human population?
A. Africans having a tall and skinny body to dissipate heat B. Inuits in Greenland having a stockier body shape to retain heat C. Africans carrying the sickle trait in areas where malaria is prevalent D. people in the northern regions having less pigmentation in order to obtain more vitamin D E. All the answer options are correct.
The methanogens, producers of methane gas, require environments that
A. are directly exposed to sunlight. B. have abundant oxygen and CO2. C. are extremely cold. D. are very acidic. E. are anaerobic with hydrogen gas and CO2.
Which statement is false concerning movement of molecules across the cell membrane?
A) Water and gas molecules have no difficulty. B) Small uncharged molecules pass through easily. C) Large molecules do not pass through easily. D) Charged molecules do not pass through easily. E) Lipid molecules do not pass through easily.
Suppose that an adult black bear adds 50 pounds of fat in order to survive while hibernating through the winter. Approximately how much glycogen would a bear have to add to achieve a similar feat?
A) 25 pounds B) 50 pounds C) 75 pounds D) 100 pounds