Considering the traditional view of ecological
succession, which of the following plants
would most likely be a pioneer species in a
primary succession event?
a. an oak tree that produces acorns dispersed
by squirrels
b. a snapdragon flower pollinated by bees
c. a dandelion which produces seeds asexually
and disperses seeds by the wind
d. it could be any of these
e. it couldn’t be any of these
C
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Why do histone genes have the slowest molecular clock?
A. The structure of the histone gene must be conserved for DNA to function properly. B. Histone genes simply do not have the same rate of mutations. C. DNA-correcting mechanisms function more readily with histone genes. D. Cells have more histone genes than any other kind of gene. E. Histone genes normally have selfcorrecting mechanisms.
Short tandem repeats (STRs)
A. are useful in identifying specific individuals. B. are important sites in vectors where foreign DNA can be integrated. C. are errors that can arise during DNA sequencing. D. are DNA fragments generated during PCR.
Sickle cell anemia is a genetic disease caused by the replacement of one amino acid in the hemoglobin molecule. This
replacement changes the shape and function of the hemoglobin protein in dramatic ways, which can sometimes be lethal. How can the substitution of one amino acid lead to such drastic results? What will be an ideal response?
Higher solute concentration (less water) than the cytoplasm of a cell; causes cell to lose water by osmosis.
What will be an ideal response?