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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Bones of a synovial joint are held together by
A. articular cartilage. B. a meniscus. C. a joint capsule. D. a synovial membrane.
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.
Increased plasma concentration of lactic acid stimulates increased ventilation primarily by means of central chemoreceptors.
Answer the following statement true (T) or false (F)
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.