Placing a ripe apple in a bag of green bananas will cause the bananas to ripen quickly. This is because the apple
A) absorbs cytokinin.
B) forms digestive enzymes.
C) releases heat.
D) produces ethylene gas.
E) makes auxin.
D
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True-breeding tall snapdragons with red flowers were crossed with short snapdragons with white flowers. The resulting F1 progeny were all of medium height and had pink flowers
When the F1 progeny are crossed with each other, what proportion of the F2 progeny would be of medium height and have pink flowers? A. 1/4 B. 1/2 C. 1/8 D. 1/16 E. 3/4
The stage of disease that is characterized by early, mild symptoms is called the
A) period of illness B) incubation period C) prodromal period D) period of convalescence
Figure 23.8
In the photograph of the zygote fungus Pilobolus, what are the dark "hats" atop of the structures?
A. Hypha B. Gametangium C. Zygote D. Sporangium E. Nucleus
Which is true regarding genomes of Archaea?
a. Archaeal genomes are generally larger than those of Bacteria. b. Unlike Bacteria, Archaea do not show a strong correlation between genome size and ORF content. c. Archaea have fewer genes for carbohydrate metabolism, transport, and membrane biosynthesis. d. Archaea have fewer genes for energy and coenzyme production.