Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown
that after the bacterium enters the root, cells of the root cortex begin to divide in response to
a. a flavonoid released by soybean roots.
b. nod gene products produced by soybean roots.
c. nod gene products produced by the bacterium.
d. nitrogen fixation by the bacterium.
e. a flavonoid produced by the bacterium.
C
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The use of SNPs for analyzing genomes is based on ____
a. the nucleotide base pairing in the SNPs b. the types of nucleotides in the SNPs c. differences in SNPs among individuals d. the ratio of purines to pyrimidines in SNPs e. bonding patterns between nucleotides in the SNPs
In humans, alleles for each gene are inherited from Select one:
a. males and females (two alleles from each parent). b. males and females (one allele from each parent). c. males only (dads). d. females only (moms). e. None of the answer choices are correct.
Courtship for Anolis lizards involves the male displaying a dewlap (skin under the throat area) that varies in appearance based upon the species. Lizards that are found in darker, more shaded environments will have dewlaps that are lighter in color because they are more noticeable by potential mates. Which of the following mechanisms best explains how speciation is at work in this example?
A. Genetic drift B. Postzygotic isolation C. Natural selection D. Reinforcement
The hypodermis is composed of ____.
A. adipose and nervous tissues B. connective and adipose tissues C. blood and lymphatic vessels D. hair follicles and sweat glands E. sebaceous and sweat glands