Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus
In which stage of the cell cycle did the nucleus contain 6 picograms of DNA? A) G1
B) S
C) G2
D) M
C
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A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of _____
A) 120 adenine and 120 uracil molecules B) 120 thymine and 120 adenine molecules C) 120 cytosine and 120 thymine molecules D) 120 adenine and 120 cytosine molecules E) 120 guanine and 120 thymine molecules
Why are insectivorous plants (plants that eat insects) most common in boggy areas?
a. Because boggy soil is generally high in sulfur content. b. Because insects tend to live in boggy areas. c. Because too much "bioprospecting" has led to the disappearance of insectivorous plants from most other non-boggy areas. d. Because boggy soil often has low nitrogen concentrations. e. None of these. Insectivorous plants are, in fact, quite rare in boggy areas.
A response that is uniquely directed against pathogenic Bordetella pertussis would involve what component?
a. Skin barrier b. The complement system c. Antibodies d. Inflammation
Scientists find several sets of fossil remains in a cave. The skeletons appear have been buried with stone tools and carved jewelry of ivory and bone. The artifacts are dated to 90,000 years old
The skeletons are anatomically similar to modern humans. Based on this information, the skeletons most likely are all A) Neanderthals. B) Homo floresiensis. C) Cro-Magnons. D) Australopithecus afarensis. E) Homo erectus.