If the amino acid coding region of an mRNA molecule is 1800 nucleotides (bases) in length, this molecule will contain ________ codons.
A. 900
B. 1200
C. 600
D. 800
E. 400
Answer: C
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Increased plasma concentration of lactic acid stimulates increased ventilation primarily by means of central chemoreceptors.
Answer the following statement true (T) or false (F)
Bones of a synovial joint are held together by
A. articular cartilage. B. a meniscus. C. a joint capsule. D. a synovial membrane.
Nancy is 8 months pregnant. Her physician mentioned that the placental LH-like hormone levels had decreased. Should Nancy be concerned?
A. Yes; a drop in the secretion of an LH-like substance this late in the pregnancy will disrupt normal embryonic development. B. No; the placenta doesn't normally secrete an LH-like substance at any time during pregnancy. C. Yes; the secretion of an LH-like substance by the placenta throughout the pregnancy is necessary to maintain the pregnancy. D. No; the secretion of an LH-like substance by the placenta is important in the first trimester, and Nancy's pregnancy is beyond the first trimester.
The large, funnel-shaped chamber that connects to the ureter is called the
A) medulla. B) renal column. C) renal pelvis. D) nephron. E) calyx.