Maintaining the ozone layer is crucial for life because ozone
A) blocks low-energy infrared radiation.
B) absorbs visible light.
C) absorbs low-energy UV radiation.
D) absorbs high-energy UV radiation.
E) blocks high-energy infrared radiation.
D
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A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Competence in bacteria A is constitutively expressed. B. Competence in bacteria B is dependent on the phase of growth. C. Both bacteria A and bacteria B cells are competent. D. Neither bacteria A nor bacteria B cells are competent.
Alzheimer disease has been shown to be related to ____
a. alcoholic fermentation in the brain b. lactate fermentation in the brain c. increased brain metabolism d. decreased brain metabolism e. increased mitochondrial enzyme activity
In which ponds did male guppies have the highest mean number of spots?
a. ponds with no predators b. ponds with cichlids only c. ponds with killifish only d. ponds with cichlids and killifish
Three fatty acids bonded together with a glycerol are found in a(n):
A. triglyceride. B. phospholipid. C. alcohol. D. enzyme. E. chlorophyll pigment.