The amniotic egg of reptiles, birds, and mammals is an adaptation to
a. thwart carnivorous predators.
b. allow life on land.
c. compensate for the short period of development of the young.
d. protect the young from the nitrogenous wastes of the mother during embryonic development.
b
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Mycorrhizae are especially effective in helping plant roots uptake
A. nitrogen. B. phosphorus. C. potassium. D. iron. E. magnesium.
Which of the following is an example of the
result of a beneficial mutation?
a. A new digestive enzyme that is better at digesting cellulose. b. A new digestive enzyme that is equal in its ability to digest cellulose as the existing enzyme. c. A new digestive enzyme that is less effective at digesting cellulose. d. A new protein that interferes with the digestive process. e. A new protein that has no function
The Dlx gene encodes a transcription factor that signals clusters of embryonic cells to ____ and gives rise to an
appendage. a. fold into the cardiac muscle b. protrude from the body c. form reproductive structures d. induce apoptosis in cells lining the appendages e. develop into the immune system
Cooksonia is a genus of very early tracheophyte plants. Unlike modern tracheophytes, they only grew to a few centimeters in height. What feature provides the best explanation for their diminutive size?
A. Cooksonia species were not autotrophic. B. They consisted of only photosynthetic stems, not roots or leaves. C. They completely lacked vascular tissues. D. They did not have stomata.