Which of the following statements is true?
a. The cell walls of bacteria are composed of peptidoglycan.
b. Peptidoglycan is a fatty acid.
c. Gram-positive bacterial walls have a relatively thin layer of
d. peptidoglycan anchored to the cytoplasmic membrane by teichoic acids.
Ans: a. The cell walls of bacteria are composed of peptidoglycan.
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Genes located along the X chromosome:
A. have a full set of complementary alleles on the Y chromosome. B. are called X-linked genes. C. are contributed solely by the female parent. D. are always recessive to genes located on the Y chromosome.
Which of the following is an intermediate in the reaction that forms Ala-tRNA?
A. Alanyl-ATP B. Alanyl-ADP C. Alanyl-PPi D. Alanyl-AMP
Place the events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract. A. 1,2,4,5,3,6 B. 4,2,1,5,6,3 C. 5,2,4,1,3,6 D. 1,6,4,2,5,3 E. 4,3,1,2,5,6
In chemistry, what is a base?
a. A base is any substance that increases the hydrogen ion (H+) concentration in a solution. b. A base provides either hydrogen ions (H+) or positively charged ions that combine with hydroxide ions (OH-). c. A base provides either hydroxide ions (OH-) or negatively charged ions that combine with hydrogen ions (H+). d. A base is any substance that increases the hydroxide ion (OH-) concentration in a solute.