Which male reproductive structure is responsible for producing secretions that neutralize residual urine within the urethra before ejaculation?
a. seminal vesicles
b. prostate gland
c. Cowper’s gland
d. epididymis
c. Cowper’s gland
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Meiosis differs from mitosis in that meiosis
(a) requires two cycles of division for completion. (b) produces spores in plants but gametes in animals. (c) is only found in animals and not in plants. (d) both a and b.
Match the following items with the correct phrases.
_______1. The number of nanometers in a micrometer. _______2. The resolving power of the compound light microscope is __________ times better than the resolving power of the unaided eye. _______3. The number of micrometers in a millimeter. _______4. The resolving power of the transmission electron microscope is __________ times better than the resolving power of the scanning electron microscope. _______5. The resolving power of the transmission electron microscope is __________ times better than the resolving power of the unaided eye. a. 10 b. 100 c. 1,000 d. 1,000,000 e. 1,000,000,000
A penguin's feet are nearly as cold as ice, while the bird's core body temperature is much higher. Which of the following explains this observation?
A. countercurrent heat exchange between warm blood in arteries and cold blood in veins B. countercurrent heat exchange between warm blood in veins and cold blood in arteries C. blood supply to legs shut off by vasoconstriction D. no muscles in the feet of penguins to generate heat E. heat cannot diffuse from body core to feet because feet are too far away
Microevolution, or evolution at its smallest scale, occurs when
A) an individual's traits change in response to environmental factors. B) a community of organisms changes due to the extinction of several dominant species. C) a new species arises from an existing species. D) a population's allele frequencies change over a span of generations.