Which of the following studies the effects of loss-of-function mutations?
A. Population genetics
B. Transmission genetics
C. Molecular genetics
C
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Evolution _____________. (Mark true (t) or false (f) for each statement.)
____ is a change in allele or genotype frequency over time ____ always results in a visible change in the physical characteristics of an organism ____ is a process that takes many, many generations ____ is only seen in unicellular organisms ____ is a natural phenomenon that is outside the influence of humans ____ can only occur in the natural environment ____ is not seen in domesticated animals ____ always results in an increase in an organism's fitness ____ is inherently random in nature ____ acts on animals but not plants What will be an ideal response?
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
Members of the ____ Cnidarian lineageexist primarily as cube-shaped medusae, are active swimmers, and produce
one of the deadliest toxins made by animals.
a. Hydrozoa b. Scyphozoa c. Trematoda d. Cubozoa e. Anthozoa
Von Baer proposed that diagnostic traits for distinguishing species among vertebrates appear at the:
a. earliest stages of development. b. latest stages of development. c. earliest and latest stages of development. d. middle stages of development.