The replacement electrons for the reaction center of photosystem II come from
A) glucose.
B) photosystem I.
C) H2O.
D) O2.
E) NADPH.
C
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The secondary immune response is typically stronger than the primary response because ________ during the secondary response.
A. all classes of immunoglobulins are active B. both B and T cells are activated C. a larger population of lymphocytes reactive to antigen has developed D. the antigen is weakened by the primary response
________-driven promoters are comprised of an Inr sequence and a TATA box with or without an associated BRE.
Fill in the blank(s) with the appropriate word(s).
In the logistic model of population growth, what is expected to happen to r when N = K?
a. r will approach rmax b. r will approach 1 c. r becomes negative d. r = 0 e. r > 0
A type of virus that infects only bacteria is called a
A) bacteriophage B) retrovirus C) rhinovirus D) coronavirus