In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a
single genetic cross. You find both red-eyed females and white-eyed females as well as both red-eyed males and whiteeyed
males. The genotypes of the parents were ____.
a. Xw+Xw+; XwY
b. Xw+Xw; XwY
c. XwXw; Xw+Y
d. Xw+Xw; Xw+Y
e. XwXw; XwY
ANSWER: b
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The enzyme nitrogenase is most directly involved in the process called ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
What are plant cells:
Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
A) alanine; is a simple methyl group B) glycine; is a hydrogen atom C) glycine; is unbranched D) lysine; contains only nitrogen E) proline; forms a covalent bond with the amino group
Hydrogen bonds are non-polar.
a. true b. false