In what way might a virus contribute to cancer formation?
What will be an ideal response?
Proviral DNA may integrate near a proto-oncogene and alter its expression, thus generating an oncogene, or it may bring in an oncogene during an infection. In either case, the cell cycle can be upregulated by a virus.
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Mycorrhizae enhance plant nutrition mainly by _____
A) absorbing water and minerals through the fungal hyphae B) providing sugar to root cells, which have no chloroplasts C) converting atmospheric nitrogen to ammonia D) enabling the roots to parasitize neighboring plants E) stimulating the development of root hairs
If two phosphates were removed from ATP, the remaining molecule would be _____________
a. adenosine triphosphate b. adenosine diphosphate c. adenosine monophosphate
In sweet peas, dominant alleles C and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or
both (cc pp), the flowers are white. What will be the color of the offspring of the crosses listed below and in what proportions? (a) Cc Pp x cc pp (b) Cc Pp x Cc Pp (c) Cc PP x Cc pp (d) Cc pp x cc Pp What will be an ideal response?
During the first major divergence of life, the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from anaerobic to aerobic d. firmly in the age of aerobes e. high in oxygen, low in carbon dioxide