Salt marshes
A) occur mostly in temperate latitudes.
B) are inhabited by plants that often have root extensions rising above the water.
C) are always submerged, except during the lowest of low tides.
D) are important nurseries for fish.
A
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Because enzymes affect the speed of chemical reactions without being consumed, they are referred to as:
a. catalysts. b. cytochromes. c. activation energy. d. hydrogen acceptors. e. transformation proteins.
The equation above shows one of the reversible reactions that occur in blood. After exercise, an athlete's blood pH has dropped below the normal level. How will normal blood pH be restored?
A) An increase in 02 concentration in the plasma will lead to an increase in H+ concentrations. B) An increase in temperature will lead to an increase in H+ concentration. C) An increase in sweating will lead to a decrease in OH- and H+ concentrations. D) An increase in breathing rate will lead to a decrease in blood CO2 and H+ concentrations.
Missense mutations are a type of frameshift mutation.
a. true b. false
The waterproof cuticle covering the epidermis of land plants helps prevent dehydration, much like the skin of some land animals. As a consequence of having a cuticle, what other evolutionary adaptation was important for most land plants?
A. stomata in the leaves B. the endodermis in the root C. root hairs on the root epidermis D. trichomes on leaf surfaces E. collenchyma fibers just beneath the surface of the epidermis