Upon antigenic stimulation, CD8+ T cells differentiate into helper T cells
a. True
b. False
ANSWER: False
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Which signaling system typically involves the longest time interval between release of a signaling molecule and activation of a receptor?
A. autocrine B. juxtacrine C. paracrine D. endocrine
Streptococcus pneumoniae can escape phagocytic clearance by which mechanism?
A. Capsule-mediated inhibition of phagocytosis B. Inhibition of phagolysosome fusion C. inhibition of opsonization mediated by protein A D. Lysis of phagosome and replication in cytoplasm E. Replication in fused phagolysosome
During protein synthesis in eukaryotes, which molecule passes from the nucleus to the cytoplasm and specifies the sequence of amino acids in the new polypeptide?
A. mRNA B. tRNA C. rRNA D. RNA polymerase E. DNA
A typical body cell with 23 pairs of chromosomes is called a ________.
A. gamete B. sister cell C. somatic cell D. haploid cell