Suppose male drones were only half as costly to produce as female honeybees. What sex ratio would be opti-mal from the perspective of worker bees?
a. a 3:1 female:male sex ratio c. a 1:2 female: male sex ratio
b. a 3:2 female:male sex ratio d. a 1:6 female:male sex ratio
B
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Why do some leaves change color (red, yellow, orange, etc.) in the fall?
A. When leaves die, the chlorophyll molecules are no longer visible. B. Cold weather denatures the chlorophyll molecule, and it begins to reflect different colors. C. The chlorophyll molecule breaks down and other pigments now become visible. D. The chlorophyll molecule is modified to absorb different wavelengths of light.
Virions infecting some bacteria possess the enzyme ________ that makes a small hole in the bacterial cell wall, allowing the viral nucleic acid to enter
A) peptidoglycanase B) infectase C) lysozyme D) nuclease
A variety of E. coli clones have been isolated, and the DNA has been extracted, digested with restriction enzymes, denatured, separated by gel electrophoresis, and transferred to nylon membrane by the Southern blot procedure. A radioactive probe is used that hybridizes with a gene of interest. The DNA corresponding to a single clone yields a single DNA band after probing the blot. Based on this
information only, A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the DNA band visualized. D) the part of the gene recognized by the probe is located on the DNA band visualized. E) both choices B and D
In the figure above, the amount of energy symbolized by the line "A" would be the ____
a. reactant energy b. product energy c. cofactor energy d. activation energy e. intermediate energy