Biological nitrogen fixation is carried out ________.
A. only by a limited number of prokaryotes
B. only in totally anaerobic environments
C. only by prokaryotes in symbiotic relationships with plants
D. by prokaryotes and some protists
Answer: A
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Which of the following describes populations that are genetically isolated?
A. They do not share the same mutations. B. They do not live in the same areas. C. They do not exchange genetic information. D. They do not originate from the same population. E. They do not evolve.
Bone disorders
What will be an ideal response?
Charcot-Marie-Tooth is the most commonly inherited peripheral neuropathy, and has no known cure. Patients suffer damage to motor and sensory neurons, leading to degeneration of muscles and gradual loss of motor control.Mutation of the peripheral myelin protein 22 (PMP22) gene, which causes demyelination of peripheral neurons, is a more common cause of Charcot-Marie-Tooth disease. In which cells is the function of the PMP22 gene important for normal function?
A. Schwann cells B. Peripheral neurons C. Fibroblasts D. Astrocytes E. Oligodendrocytes
The influenza virus is typical of many animal viruses in that is has an envelope composed of lipids and glycoproteins. Which of the following statements about the envelope is ACCURATE?
A. The envelope glycoproteins are encoded by genes found in the host genome. B. The envelope is inside the capsid. C. The envelope is obtained from the host cell when the virus buds from the plasma membrane. D. The envelope is obtained from the host cell upon entry into the cell. E. The envelope is formed via the action of integrase.