You are interested in designing an experiment to test the hypothesis that frogs use the same genetic code as humans. Which of the following experiments would not give you useful data to test this hypothesis?
A) Purify tRNAs from frog cells and human cells and compare their structures.
B) Insert a human gene into a frog cell and see if the correct protein is produced.
C) Insert a frog gene into a human cell and see if the correct protein is produced.
D) Compare nucleotide sequences of promoters from similar frog and human genes.
Answer: D
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In the Ames test for mutagenicity,
A) reverse mutations convert auxotrophs to prototrophs that survive. B) colonies are due to forward mutations that convert prototrophs to auxotrophs. C) cells are treated with mutagen and only cells with no mutations survive. D) cells are treated with excess amino acids and cells with mutations are killed. E) rat liver enzymes are present to protect cells from mutation.
The transformation of a normal cell into a cancer cell is ____________________. Fill in the blank(s) with the appropriate word(s)
The cytoplasmic (plasma) membrane of bacteria:
a) retains the cytoplasm and its contents b) acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others c) is the major site of ATP synthesis (respiration) in aerobes d) all of the above
Aquifex cannot use which of the following as electron donors?
A. Sulfur B. Glucose C. Hydrogen D. Thiosulfate