_______ allow the body to remain immune to a pathogen that the immune system has encountered in the past.
a. Cytotoxic T cells
b. Dendritic cells
c. Antigen-presenting cells
d. Memory B cells
d. Memory B cells
Memory B cells allow the body to remain immune to a pathogen that the immune system has encountered in the past.
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Which of the following is not true of miRNA processing?
A. Drosha processes primary miRNA transcripts to precursor miRNAs. B. RISC binds to pre-miRNA in the cytoplasm. C. RNA helicase is necessary for unwinding the miRNA duplex. D. Dicer completes the processing by cleaving the single-stranded form of the miRNA.
The integration of phage DNA into the bacterial chromosome occurs because of
A. the phage's ability to synthesize an enzyme that integrates its DNA into the host's chromosome. B. the phage's ability to synthesize enzymes to enter the bacterium. C. similar RNA nucleotides in both. D. the similarity in enzyme metabolism. E. the phage's ability to synthesize enzymes to enter the bacterium AND similar RNA nucleotides in both.
How does a sarcomere shorten using the sliding filament mechanism of muscle contraction?
A) Actin and myosin filaments shorten and slide past each other. B) As they slide past each other, actin filaments shorten, while myosin filaments do not shorten. C) Actin and myosin filaments do not shorten, but they do slide past each other. D) As they slide past each other, myosin filaments shorten, while actin filaments do not shorten.
Viral DNA is replicated by:
a. viral DNA. b. conjugation. c. bacterialDNA. d. using the host's metabolic machinery and energy.