MHC markers are
a. a type of PAMP.
b. special receptors on T cells.
c. self proteins on body cells.
d. antibodies attached to a B cell plasma
membrane.
e. Y-shaped proteins secreted by B cells.
C
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What will be an ideal response?
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Early geneticists wondered how only four nucleotides can specify the sequence of 20 amino acids in proteins. They hypothesized that there must be a code that linked the nucleotide sequence in a gene to the amino acid sequence in a protein. Each nucleotide code is called a codon. Today we know that there is a genetic code in which __________ nucleotide(s) code(s) for each amino acid.
A. 1 B. 3 C. 2 D. 4