Which of the following statements concerning infection with Toxoplasma is FALSE?
A) It is one of the world's most widely distributed protozoan parasites in humans.
B) It is typically contracted by eating undercooked meat.
C) Even though it can be transmitted across the placenta, it is harmless to the fetus.
D) The majority of infected people are asymptomatic.
E) It usually results in no permanent damage and is self-limiting.
C
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The Calvin cycle of a plant exposed to light during the day that is suddenly put in the dark
A. cannot run, as it requires light energy directly. B. runs in a different place in the plant. C. can still run as long as there is ATP, CO2, and NADPH present. D. uses a different source of carbon.
Which of the following is not a category of symbiosis?
A. Parasitism B. Mutualism C. Commensalism D. Communalism
Resistance of Pseudomonas to a wide range of antibacterial agents is partly due to its
A) production of exoenzyme S. B) use of the Entner-Doudoroff pathway as its major means of catabolizing glucose. C) ability to utilize a wide range of organic and nitrogen sources. D) ability to metabolize many drugs. E) lack of special requirements for growth.
The primers in PCR are
A. bacterial enzymes. B. reverse transcriptases. C. DNA polymerases. D. synthetic DNA oligonucleotides. E. short RNA strands.