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%

Biology & Microbiology

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Antibodies are found in

A) milk. B) mucosal secretions. C) serum. D) milk, mucosal secretions, and serum.

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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

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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).

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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

Biology & Microbiology