The 'clonal selection hypothesis' explains the proliferation and maturation of lymphocytes involved in the adaptive immunity
a. true
b. false
Ans: a. true
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Which of the following regulates paracellular transport?
A) adherens junctions B) gap junctions C) desmosomes D) tight junctions E) hemidesmosomes
With regard to RNA polymerase proofreading ability, which of the following is true?
A) RNA backtracking can remove noncomplementary nucleotides. B) RNA and DNA polymerase proofreading are essentially identical. C) There are specialized mRNA repair pathways that remove noncomplementary nucleotides. D) No proofreading occurs. E) A 3' ? 5' exonuclease fixes all errors in mRNA.
Which of the following proteins do not pass through the Golgi apparatus?
a. Lysosomal enzymes b. Cell surface proteins c. Ribosomal proteins d. Proteins secreted by exocytosis
Ribosomes are made up of which kind of nucleic acid?
A) mRNA B) tRNA C) rRNA D) DNA