How is the Ames test for mutagenicity useful for identifying potential carcinogens?
A) Bacteria do not get cancer so they can survive lethal carcinogens.
B) Substances that mutate bacterial DNA are likely to mutate human DNA.
C) Bacteria thrive on substances that could cause cancer in humans.
D) The same genes that cause cancer in humans can be mutated in bacteria.
E) Liver enzymes alter the bacteria so they will behave like human cells.
B) Substances that mutate bacterial DNA are likely to mutate human DNA.
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Many chemolithotrophs are able to produce more ATP from oxidation of their inorganic energy source than chemoheterotrophs produce from the aerobic oxidation of glucose.
Answer the following statement true (T) or false (F)
Which of the following proteins-functions is mismatched?
A. DNA polymerase-DNA synthesis B. DNA polymerase-primer removal and replacement with DNA C. DNA primase-production of RNA primer D. topoisomerase-separates double-stranded DNA into single strands E. single-stranded binding proteins-prevents single DNA strands from reforming into a double helix
If Argus fell into the waters around Labrador (temperature 1°C, or 34°F), what reaction is most likely to happen?
A) dilation of the blood vessels of the dermis B) sweating C) piloerection D) increased blood flow to hands
Which of the following statements is correct regarding chromosomes?
A) Chromosomes are strands of DNA, tightly wrapped up, that are located everywhere in the cell. B) Chromosomes are strands of RNA, tightly wrapped up, that are in the cytoplasm. C) Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus. D) Chromosomes are strands of RNA, loosely wrapped up, that are located everywhere in the cell.