All of the following are adaptations against excessive water and salt exchange between animals and their surrounding environment except:
a. having very permeable tissues.
b. covering body with mucus.
c. living inside a tube that can be isolated from the external environment.
d. covering the body with a hard exoskeleton.
e. actively absorbing salt ions with gills.
A
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The phenotype of ____ does not develop until adulthood
a. muscular dystrophy b. Marfan syndrome c. cystic fibrosis d. hemophilia e. Huntington's disease
Which statement correctly describes DNA base pairing?
a. Two hydrogen bonds bind A and T; three hydrogen bonds bind G and C. b. Two hydrogen bonds bind A and C; three hydrogen bonds bind T and G. c. Two hydrogen bonds bind G and C; three hydrogen bonds bind A and T. d. Two hydrogen bonds bind A and T, and two hydrogen bonds bind G and C. e. Three hydrogen bonds bind A and C, and three hydrogen bonds bind T and G.
Reverse transcriptase does not have a high degree of fidelity. This means that
A. the immune system is more likely to recognize RNA viruses compared to DNA viruses. B. RNA viruses tend to be more prone to evolution compared to DNA viruses. C. DNA viruses tend to be more prone to evolution compared to RNA viruses. D. vaccinations are more easily created for RNA viruses that use this enzyme.
In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. cytokinin B. gibberellin C. abscisic acid D. ethylene E. auxin