Which statement about HIV is FALSE?
a. HIV infection results in a dramatic decline in the T helper cell population.
b. The first cells targeted by HIV are dendritic cells.
c. T cytotoxic cells are the main cells that attack HIV.
d. Dendritic cells transport HIV from the mucosa to the lymph nodes.
e. HIV attaches to the CD4 component of TH cells.
e
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Dmitry Mendeleev arranged all the elements by ________ in the periodic table so elements in the same ________ behave in similar ways
a. number of neutrons / column b. mass number / row c. number of electrons / row d. atomic number / column
The recognition site for a restriction enzyme is 5? ACC^GGT 3?. The ^ symbol indicates the site of cleavage. After digestion of DNA with this restriction enzyme, how will the ends of the resulting DNA fragments look?
A) They will have sticky, single-stranded ends with 5? overhangs. B) They will have sticky, single-stranded ends with 3? overhangs. C) They will have blunt ends. D) They will have sticky, double-stranded ends. E) The result cannot be predicted using only this information.
The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.
____ refers to multiple independent pairs of genes having similar and additive effects on the same characteristic
a. Codominance b. Epistasis c. Polygenic inheritance d. Complete dominance e. Additive dominance