Which of the following is the best description of an adaptation?
a. a trait that was beneficial to survival in the past
b. a trait that is currently beneficial to survival
c. a trait that will be beneficial in the future
d. a trait that is of no advantage to survival
e. an environmental change that selects for certain traits
B
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Why do we have storage macromolecules, such as fats, in our bodies?
Why do we have storage macromolecules, such as fats, in our bodies?
Generally speaking, a nucleotide substitution has less severe consequences than a nucleotide addition/deletion
A. true B. false
Four of the five choices listed below are made only
of gametophyte tissue. Select the exception. a. pollen grains b. megaspore c. ovule d. pollen tube e. male gametophyte
The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because
A. red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B. the parasite damages leukocytes along with RBCs. C. RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D. complement cannot effectively destroy RBCs. E. RBCs never enter lymphoid tissue.