If an adult person has a faulty version of the human analog to ced-4 of the nematode, which of the following is most likely to result?
A) activation of a developmental pathway found in the worm but not in humans
B) a form of cancer in which there is insufficient apoptosis
C) formation of molecular pores in the mitochondrial outer membrane
D) excess skin loss
B
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The production of ________ by ________ is thought to be a major contributor to the biodeterioration of stone building materials
A) oxalic acid / fungi B) sulfuric acid / sulfate reducers C) nitric acid / nitrate reducers D) carbonic acid / lichens
If you cross two pea plants, one with green peas and the other with yellow peas, you find all of the offspring have yellow peas. You conclude
A. yellow is dominant over green. B. yellow is incompletely dominant over green. C. color is random in pea plants. D. green is dominant over yellow. E. yellow and green are codominant.
In DNA, the most important reason adenine does not ever pair up with cytosine is that: a. There is a size problem that prevents pairing. b. Adenine bonds with two hydrogen bonds, and cytosine bonds with threehydrogen bonds
c. Adenine bonds with three hydrogen bonds and cytosine bonds with two hydrogenbonds. d. Adenine can occasionally bond with cytosine.
A drug that blocked the Na+/K+ ATPase would have what effect on ion concentrations and the membrane potential?
a. The ion concentrations across the membrane would immediately equalize and the membrane potential would go to zero. b. Ion concentrations would slowly equalize, and over time, the membrane potential would become more negative. c. Ion concentrations would slowly equalize, and over time, the membrane potential would go toward zero. d. Ion concentrations would not change, but the membrane potential would go to zero.