A reaction involving Substance X yields among its products one denoted as XH. What conclusion can be drawn from this fact?
a. Substance X has absorbed a neutron, becoming an unstable heavy isotope.
b. Substance X has been reduced after accepting an electron from another reactant.
c. Substance X has formed a hydrogen bond with the other reactants in this reaction.
d. The products of this reaction are Substance X and a significant amount of heat.
b. Substance X has been reduced after accepting an electron from another reactant.
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Glial cells function to
a. conduct electrical impulses. b. support and nourish neurons. c. secrete collagen fibers into the extracellular matrix. d. release secretions on to a free surface. e. move ions across the cell membrane.
The leaf-cutter ants of Central America use leaves as food to cultivate the basidiomycete Lepiota in special underground chambers. To use leaves as an energy source, Lepiota must do which of the following?
A. secrete enzymes to digest cellulose B. ingest and break down the leaves C. secrete enzymes to digest chitin D. produce antibiotics to kill the ascomycete E. produce antibiotics to kill Streptomyces
The synthesis site for the hormones of this
figure is indicated by a. A. b. B. c. C. d. D. e. E.
Sickle-cell anemia results from a point mutation in the HBB gene. The mutation results in the replacement of an amino acid that has
(a) hydrophilic R-group with an amino acid that has a hydrophobic R-group on the exterior of the hemoglobin protein. Such a mutation would most likely result in altered (A) properties of the molecule as a result of abnormal interactions between adjacent hemoglobin molecules (B) DNA structure as a result of abnormal hydrogen bonding between nitrogenous bases (C) fatty acid structure as a result of changes in ionic interactions between adjacent fatty acid chains (D) protein secondary structure as a result of abnormal hydrophobic interactions between R-groups in the backbone of the protein