Which of the following is a false statement about plant secondary metabolites?
A. Some of them can cross the placenta during pregnancy.
B. They are too unpredictable to use in pharmaceutical research.
C. Some can be used to treat human diseases.
D. The activity of certain medicines is due to secondary metabolites.
E. Some can be poisonous to humans.
Answer: B
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Irradiation of cells with ultraviolet light may cause
A. four nucleotides to covalently bind together. B. thymine dimers. C. adenine complementary base pairing with cytosine. D. the addition of uracil.
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a. amygdala b. hypothalamus c. adrenal cortex d. anterior pituitary gland e. thyroid
Concerning the sex chromosomes, which of the following is correct?
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