Gene methylation can be detected through the use of restriction endonucleases. Usually these are used in pairs where one enzyme will digest only unmethylated DNA in its recognition sequence while the other is insensitive to methylation
Which of the following statements is correct?
A. The enzyme that is insensitive to methylation serves as a control to make sure the inability of the other enzyme to digest DNA is not due to a mutation
B. These are used in pairs since experiments have to be replicated and this one way of performing a replication of the experiment
C. The experimental design is flawed since there should be a third enzyme that would serve as a positive cocntrol
D. This experimental design is able to detect most of the methylated C residues in a particular region of DNA.
A
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Which of the following terms is most closely related to genetic complementation?
A. Reverse transcription B. Naked DNA C. Phenotypic rescue D. SOS response
Protection of the embryo is a major requirement for land plants given there is no aquatic environment in which to keep it safe from desiccation and other environmental hazards. Which structure, in both seed and seedless plants, provides the protection and nutrients needed by the embryo as it develops?
a. sporangium b. gametangia c. female gametophyte d. archegonium
Which of the following statements is false?
a. Neurons in the brain can interpret incoming action potentials only in certain ways. b. Optic nerve impulses can only be interpreted as light. c. Sensory neurons do not follow the all-or-none law. d. The stronger the stimulus, the more action potentials are generated. e. A strong stimulus activates many adjacent receptors, thereby increasing the number of action potentials and the level of awareness for the stimulus.
You would not expect sebum to be involved in:
a. keeping hair moist. b. contributing to the color of the skin. c. making the skin supple. d. inhibiting bacterial growth. e. preventing desiccation of the skin.