All of the following statements referring to the uterine cycle are true except ________.
A) FSH and LH directly promote development of the uterine endometrium
B) estrogen is secreted by the developing follicle in the follicular phase of the cycle
C) the corpus luteum is formed from the ruptured follicle after ovulation
D) a decrease in the levels of ovarian hormones signals menstruation
A) FSH and LH directly promote development of the uterine endometrium
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The enzyme ________ is required for the synthesis of mRNA
A) DNA polymerase B) RNA polymerase C) DNA isomerase D) RNA isomerase E) RNA synthase
In ______________, carrier molecules move a substance against (up) the concentration gradient
A. facilitated diffusion B. simple diffusion C. endocytosis D. active transport E. exocytosis
Which of the following is an ascending tract of the spinal cord?
A. Ventral corticospinal tract B. Medial reticulospinal tract C. Gracile fasciculus D. Vestibulospinal tract E. Lateral tectospinal tract
Which of the following is one of the steps that ends a contraction?
A) Sarcoplasmic reticulum absorbs sodium ions. B) Acetylcholine binds to receptors on the sarcolemma. C) Calcium ions bind to troponin. D) Acetylcholine is broken down by acetylcholinesterase. E) An action potential spreads across the entire surface of the muscle fiber.