Natural selection favoring the heterozygote
a. increases the genetic variability of a population
b. decreases the genetic variability of a population
c. maintains the genetic variability of a population
c
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Antibodies are soluble proteins produced by T cells
Indicate whether the statement is true or false.
A 26-year-old woman has an odorous vaginal discharge, lower abdominal pain, and difficulty urinating. Vaginal secretions are collected and sent to the laboratory for examination 3 hours af-ter collection. No motile organisms are observed on the wet preparation; however, T. vaginalis is suspected. Which one of the following statements explains this discrepancy?
a. The infection is most likely bacterial; therefore a Gram stain should have been performed. b. The specimen should have been refrige-rated before examination; consequently, the organism was compromised. c. The time between collection and the mi-croscopic examination was prolonged, resulting in loss of motility. d. No discrepancy is present; this organism in nonmotile.
. Magnesium has 12 protons. How many electrons are
in its third energy level? a. 2 b. 4 c. 6 d. 8 e. 10
Describe how maternal effect genes and segmentation genes work together in the early embryonic stages of
Drosophila. What will be an ideal response?