Refer to Table 19-1. The frequency of the recessive allele, d, is:
a. 0.15.
b. 0.25.
c. 0.35.
d. 0.55.
e. 0.75.
D
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Which segment gene is activated first in the Drosophila embryo?
A. pair-rule genes B. segment-polarity genes C. gap genes D. myogenic bHLH genes
Which of the following analogies best illustrates the answer to the following: If sugars contain energy, why do we have to break apart sugars to release energy in order to make the high energy chemical called ATP?
a. electrons of matter b. photons of light c. letters in the word d. books in the library
The ________ is a type of vascular tissue that conducts water.
Fill in the blank(s) with the appropriate word(s).
If a heterotrophic bacterium were grown in a minimal glucose medium and transferred during exponential growth phase into the complex LB medium, the cell would have a relatively
a. short exponential phase because it already is in exponential growth phase. b. high growth yield compared to cells transferred during stationary growth phase. c. long lag phase because it has to adjust to a different chemical environment/medium. d. short lag phase because of the availability of amino acids and other nutrients.