Which of the following is NOT used as evidence that mitochondria and chloroplasts may have arisen according to the endosymbiotic relationship?
a. They have their own membranes and are the same size as bacteria.
b. They possess their own type of DNA different from that found in the nucleus.
c. They can live an independent existence when isolated from a cell.
d. They possess their own ribosomes.
Answer: c. They can live an independent existence when isolated from a cell.
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When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result?
A) The gene involved is on the Y chromosome. B) The gene involved is on the X chromosome. C) The gene involved is on an autosome, but only in males. D) Other male-specific factors influence eye color in flies. E) Other female-specific factors influence eye color in flies.
Superantigens activate more T cells than a normal immune response
Indicate whether the statement is true or false.
An anorexic person
A) is usually overweight. B) has a bacterial infection in the stomach. C) eats very little food. D) is usually treated with antibiotics. E) eats a meal and then vomits.
Within the epidermis of leaves are ________, through which gases, such as carbon dioxide and oxygen, pass.
A. stomata B. vessel elements C. trichomes D. root hairs