Cell communication is critical for the function of both unicellular and multicellular eukaryotes. Which of the following is likely true of cell signaling?
(A) Cell signaling uses the highest molecular weight molecules found in living cells.
(B) Cell signaling has largely been replaced by other cell functions in higher mammals.
(C) Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes.
(D) Cell signaling functions mainly during early developmental stages.
Answer: (C) Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes.
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Each nucleosome contains:
A. four proteins: H2A, H2B, H3, and H4 B. a histone octamer composed of two copies of each of the following proteins: H1, H2, H3, and H4 C. a histone octamer composed of two copies of each of the following proteins: H2A, H2B, H3, and H4 D. four proteins: SMC1, SMC2, SMC3, and SMC4 E. a mixture of histone and SMC proteins.
Prior to the 1940s, many biologists believed ____, which is composed of 20 different types of ____, was most likely the
genetic material.
a. protein; amino acids b. DNA; amino acids c. protein; nucleotides d. DNA; nucleotides e. RNA; nucleotides
Four of the five hormones listed below have a
common source. Select the exception. a. aldosterone b. glucocorticoid c. cortisol d. adrenalin e. mineralocorticoid
What are responsible for the rapid mobilization of
the immune response after a subsequent attack by a pathogen? a. naive B cells b. naive T cells c. NK cells d. memory cells e. macrophages