A metabolic pathway results in the synthesis of a hormone. The presence of that hormone inhibits the second reaction in the pathway. Which of the following terms are appropriate descriptions of this inhibition?A) End-product inhibitionB) Negative feedbackC) Covalent modificationD) Catabolic inhibitionE) Affinity
What will be an ideal response?
A, B
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The number of bones in the adult human skeleton is ____________________.
Fill in the blank(s) with the appropriate word(s).
Contraction of the dartos muscle
A) tightens the scrotum. B) produces an erection. C) propels sperm through the urethra. D) moves sperm through the ductus deferens. E) initiates seminal emission.
Which of the following is true?
A. The three ingredients of ejaculate are sperm, semen, and prostate-specific antigen. B. Sperm are composed of seminal fluid within a cell membrane. C. Semen is composed of seminal fluid and sperm. D. Seminal fluid is composed of semen and sperm.
The primary inhibitory neurotransmitter in the brain is
A. glutamate. B. serotonin. C. serine. D. GABA. E. valine.