Four of the following elements make up the majority of atoms in living things. Which element is the
exception?
a. carbon
b. hydrogen
c. iron
d. nitrogen
e. oxygen
C
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If a DNA molecule was a spiral staircase, what would the steps of the staircase be?
a. covalent bonds b. deoxyribose c. base pairs d. hydrogen bonds e. phosphate
Cytotoxic T cells will bind with their TCR to which of the following?
A) antigens presented with MHC I molecules B) antigens presented with MHC II molecules C) free antigen in a soluble form D) haptens only
The anatomical structure identified with the letter
“C” in the figure above is a. the arterial wall. b. the lumen. c. atherosclerotic plaque. d. the capillary wall. e. none of these.
To reinforce cell identity, vertebrate cells can methylate which nucleotide?
A. cytosine that falls next to guanine in the sequence CG B. any cytosine C. any cytosine or guanine D. guanine that falls next to cytosine in the sequence CG E. any guanine