Which of the following is true regarding linkage maps?
A) always have a total of 100 map units.
B) can be used to pinpoint the precise physical position of a gene on a chromosome.
C) are a genetic map based on recombination frequencies.
D) require preparation of karyotypes.
E) reflect the frequency of crossing over between X and Y chromosomes.
Ans: C) are a genetic map based on recombination frequencies.
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Which of the following is a function of the mitochondrion?
A. Electron transport B. Tricarboxylic acid cycle enzyme reactions C. ATP synthesis D. All of the choices are correct.
Four of the five viruses listed below are enveloped in
membrane from the host cell. Select the exception. a. adenoviruses b. influenzaviruses c. herpesviruses d. smallpox virus e. virus that causes AIDS
What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?
A. The cell continuously produces more ions to replace those moved by the pump, maintaining a constant supply. B. Leak channels are always open, allowing the passage of sodium ions (Na+) and potassium ions (K+) across the membrane. C. Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.
Oogenesis differs from spermatogenesis in ________
A) the number of functional gametes produced B) when it is completed C) the size of gametes produced D) All of the above are true.