Why is it so important to have several controls over the amount of calcium in the blood?
What will be an ideal response?
Calcium is a major component of the skeletal system but is also critical for muscle contraction, including that of the heart, and is necessary for nervous impulse conduction.
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Although 61 different codons code for amino acids, cells contain fewer than 61 different tRNAs. Why?
A. Because the 5' base on the tRNA anticodon has some flexibility (wobble); thus, some tRNA anticodons can pair with more than one mRNA codon. B. Although 61 different codons code for amino acids, any given cell contains fewer than 61. C. Because the 5' base on the mRNA codon has some flexibility (wobble); thus, some mRNA codons can pair with more than one tRNA anticodon. D. Because each amino acid is coded for by just one codon.
Compare and contrast simple diffusion, osmosis, and facilitated diffusion. What will be an ideal response?
Which cells are important elements that comprise antibody-mediated immunity?
A) B cells B) cytotoxic T cells C) helper T cells D) macrophages
Compare and contrast Yersinia pestis and Francisella tularensis with respect to clinical manifestations, mechanisms of transmission, reservoirs, and pathogenesis.
What will be an ideal response?