Structural genes code for
A. ribosomal RNA molecules.
B. transfer RNA molecules.
C. gene expression elements.
D. cellular proteins.
E. All of these choices are correct.
Answer: D
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Which of the following regions produces hormones that are secreted by the pituitary gland?
A. cerebrum B. cerebellum C. thalamus D. hypothalamus E. medulla oblongata
Dry outgrowths of the ovary wall of a maple fruit form “wings” allowing these fruits to be dispersed by ____
a. mammals b. insects c. water d. gravity
e. windSulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because ________.
A. humans do not use folic acid B. humans synthesize folic acid by a process that is not sensitive to sulfonamides C. humans do not synthesize folic acid but obtain it in their diets D. None of the choices are correct.
The failure of chromosomes to separate during
mitosis or meiosis is called a. genetic displacement. b. trisomy. c. crossing over. d. nondisjunction. e. disjunction.