There is concern over the use of 2,4-D, a synthetic plant hormone, as a weed killer because the by-product dioxin
A) can cause irreversible mutations in crop plants.
B) causes fruit to drop prematurely from plants.
C) can cause birth defects and leukemia in mammals.
D) weakens the shells of the eggs of predatory birds, resulting in the death of their offspring.
Ans: C) can cause birth defects and leukemia in mammals.
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Which of the following pairs is incorrectly matched?
A. macrophage; class II MHC protein B. B cell; class I MHC protein C. B cell; IL-2 secretion D. helper T cell; CD4 E. cytotoxic T cell; class I MHC protein
You label cells with a radioactive isotope of sulfur (35S). The only molecules that would be radioactively labeled in these cells are:
A. Proteins B. Lipids C. Carbohydrates D. Nucleic acids
A fat is said to be saturated if
A. there are many double bonds present in the molecule. B. there are only single bonds between each pair of carbons. C. the fat molecule cannot contain any more covalent bonds. D. there are as many double bonds present as possible.
If free to move, a molecule will always move from an area of higher concentration to an area of lower concentration.
a. true b. false