Which of the following is an example of translational regulation?
A) protein degradation
B) DNA splicing
C) protein folding
D) mRNA degradation
E) DNA methylation
D) mRNA degradation
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Which of the following statements regarding the G1 (first gap) phase of the eukaryotic cell cycle is NOT true?
A. Most cells spend the majority of their lives in the G1 phase of the cell cycle. B. Cells that are terminally differentiated and will not divide mitotically might exit the G1 phase and enter the G0 phase. C. If environmental conditions are favorable during the G1 phase, G1 cyclins are degraded causing the cell to prepare to replicate its DNA. D. The G1 phase is only part of interphase. E. If DNA is heavily damaged, checkpoint proteins will delay the cell cycle; the damage will either be fixed or cell division will be permanently stopped.
Carotenoids are important to many plants because these pigments are able to
A. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. B. absorb wavelengths of light that neither chlorophyll a nor b can absorb. C. store electrons for use during the "dark" reaction of photosynthesis. D. absorb water so that hydrolysis can be carried out in the chloroplasts. E. remove carbon dioxide from the air.
What plant group has the largest number of living species?
A) Seedless vascular plants B) Cone-bearing plants C) Flowering plants D) Seedless, nonvascular plants
How do monoamine oxidase (MAO) inhibitors work?
A. By catabolism of catecholamines by the enzyme monoamine oxidase (MAO) B. Decrease the amount of DA, NE and EPI in nerve terminals C. Allow more catecholamines to enter vesicles for release and decrease their reuptake D. Decrease the amount of catecholamine storage through reuptake