T and B cells help preserve the memory of certain pathogens in a(n) _______________ immune response.
A) adaptive
B) imagined
C) natural
D) innate
Ans: A) adaptive
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Nine of every ten cardiovascular patients also have ________
a. periodontal disease b. benign skin tumors c. kidney failure d. diabetes
Which are the four types of animal tissues that develop into specialized structures?
a. Nervous, muscle, connective, and epithelial b. Nervous, transport, connective, and epithelial c. Nervous, muscle, reproductive, and connective d. Nervous, muscle, reproductive, and epidermal
Phylogenetic trees show inferred evolutionary relationships in the form of multiple branching lineages connected by nodes.
Answer the following statement true (T) or false (F)
Each of the following statements about the citric acid cycle is true except
A) Oxidation by transfer of electrons to coenzymes occurs at two steps. B) Decarboxylation to release CO2 occurs at two steps. C) Substrate-level phosphorylation generates ATP/GTP at one step. D) Acetate enters the citric acid cycle and joins a four-carbon acceptor molecule to form citrate. E) The cycle involves the ordered activity of eight enzymes.