Elizabeth takes a prescription drug that dilates her arterioles. What does this do to her blood pressure? Why?
A. It rises because this increases the cross-sectional area of the vessels.
B. It rises because this decreases the cross-sectional area of the vessels.
C. It stays the same because venules, not arterioles, control blood pressure.
D. It falls because this increases the cross-sectional area of the vessels.
E. It falls because this decreases the cross-sectional area of the vessels.
Answer: D
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What cyclic process results from the introduction of sewage as nutrients?
a. Biological magnification b. Decomposition c. Eutrophication d. Photosynthesis
The image below diagrams the action of an enzyme. Notice that the enzyme is depicted as being more tightly wrapped around the substrates in step 2 than it is in step 1. Why is this?
a. When a substrate locks into the active site of an enzyme, the enzyme changes shape to mold itself around the substrates. b. Generally, the size of a substrate is larger than the size of the active site into which it must fit. When the substrate enters the active site, the active site must stretch to fit. c. Before catalysis can occur, a substrate must change its shape so that it fits into the active site of the enzyme more precisely. d. Most active sites are only designed to hold one substrate. In this image, two substrates enter the active site, creating a tighter fit.
Freon, CCl2F2, is _____ because _____.
A. a structural isomer...there are several possible covalent arrangements B. a geometric isomer...free rotation about the bond axis is not possible C. an enantiomer...the carbon is asymmetric D. an enantiomer...the molecule exists in two mirror-image configurations E. not an isomer...there is only one structural configuration for the molecule
When a certain allele at a particular gene loci has a frequency of 1.0 in a population, it is considered _____ for that population.
a) dominant b) lost c) recessive d) fixed e) balanced.