The two scientists credited with the formulation of the cell theory (cell doctrine) from the 1800s are
A. Watson and Crick.
B. Schleiden and Schwann.
C. Schleiden and Hooke.
D. Schwann and Jenner.
E. Ben and Jerry.
B. Schleiden and Schwann.
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Hemophilia is caused by an X-linked recessive mutation in humans. If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability that their first child will have hemophilia? (Assume that no other cases of hemophilia and no hidden carriers exist in the pedigree.)
A) 0 B) 1/4 C) 1/2 D) 1/8 E) 1
What genetic information involves the description of a physical trait such as wrinkled seeds?
C4 plants occur more commonly in desert conditions because _________.
A. C4 plants produce water as a product of their photosynthetic pathways. B. C4 plants can shuttle CO2 to the sites of photosynthesis even when their stomata are closed to conserve water. C. C4 plants can conserve water even with their stomata open. D. C4 plants are succulent (water-storing) plants.
In a plant bending toward light, you would expect ________ to have increased in activity.
A. gibberellins. B. expansins. C. cytokinins. D. ethylene.