All cancers reflect, at the most general level, a defect in
A) DNA replication.
B) the formation of mitochondria.
C) cell membrane structure.
D) the cell cycle.
D) the cell cycle.
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The fruitfly cross shown here analyzes the transmission of two genes on the X chromosome. In the parental generation, the male parent carries mutant alleles for both the white gene (w) and the crossveinless gene (cw)
The female parent carries nonmutant forms of these genes. A cross between siblings of the F1 generationâ€"a red-eyed, crossveined female and a red-eyed, crossveined maleâ€"generates F2 progeny. Examine the genotype of the F2 male progeny. Notice that the progeny fall into two groups. Refer to this figure when answering the following question: The numbers of male F2 progeny with each of the four observed phenotypes are as follows: Red-eyed, crossveined = 357 White-eyed, crossveinless = 341 Red-eyed, crossveinless = 52 White-eyed crossveined = 45 What is the map distance between the two genes w and cw? A. 97 B. 12.2 C. 341 D. 357 E. 13.9
What causes tidal overmixing in estuaries?
a. strong tidal currents. b. strong river flow. c. an unstable water column. d. downwelling. e. animal migrations.
Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fe' moiety (stem of the Y-shaped antibody) o rIgG, exerting an antiopsonin (and therefore strongly antiphagocytic) effect?
A. capsule B. protein A C. cytolytic exotoxins D. superantigen exotoxins E. DNAse enzymes
The ribosomes in chloroplasts are ________, and in cytoplasm they are ________
a. 70S / 70S b. 70S / 80S c. 80S / 70S d. 80S / 80S