Which type of mutation converts a nucleotide to an alternative structure with the same composition but a slightly different placement of rare, less stable hydrogen bonds that cause base-pair mismatch?
A) depurination
B) deamination
C) tautomeric shift
D) transition
E) transversion
C
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Due to a mutation in a smooth muscle gene, the blood vessels in the skin of a certain strain of mouse become dilated when temperature falls below a certain point. Based on the likely outcome of this mutation, what precautions should the researchers take to maintain the health of their mice?
A. The mice will be susceptible to high blood pressure, and should not be provided with exercise wheels. B. The mice will have weak muscles, and should be provided with exercise wheels. C. The mouse room should be consistently maintained at a warm temperature. D. The mouse room should be maintained at a cooler than normal temperature.
Uncontrolled growth of algae in an aquatic ecosystem is due to a process known as ________, caused by excessive inputs of nutrients.
Fill in the blank(s) with the appropriate word(s).
Consider the observations that a label on one head of a myosin V dimer moves in steps of 72 nm, but a label much nearer the myosin tail moves in steps of 36 nm
Discuss how these observations support a hand-over-hand mechanism rather than an inchworm mechanism of myosin V motility on an actin filament. What will be an ideal response?
An area with many endemic species, some of which are disappearing.
A. hotspot B. habitat loss C. edge effects D. megafaunal extinction E. extinction vortex