A mutation creates a dominant negative allele of a particular gene. The gene encodes a protein that forms a trimer within the cell. If one or more of the subunits has the mutant structure, the entire trimeric protein is inactive. In a heterozygous cell, if the proteins of both alleles are present at the same levels, what percent of the trimers present in the cell will be active?
A) 100%
B) 87.5%
C) 50%
D) 33%
E) 12.5%
E) 12.5%
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Antibodies are found in
A) milk. B) mucosal secretions. C) serum. D) milk, mucosal secretions, and serum.
Which assisted reproductive technology involves the maturation and fertilization of the egg within laboratory glassware, followed by transfer of the embryo to the uterus 2-4 days later?
A. Surrogate mother B. In vitro fertilization C. Artificial insemination D. Intracytoplasmic sperm injection E. Gamete intrafallopian transfer
Selective toxicity antimicrobials are easier to develop against bacteria because they are ________ cells, whereas human cells are eukaryotic.
Fill in the blank(s) with the appropriate word(s).
In most eudicots, a short stalk called a ____ attaches the leaf to a stem.
A. vascular bundle B. petiole C. node D. bundle sheath E. stomata