A nucleated, green cell that moves by means of flagella is a(n)
A) Alga.
B) Bacterium.
C) Fungus.
D) Helminth.
E) Virus.
Ans: A) Alga.
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In specific resistance, if the plant does not have an R protein, which of the following will happen when it comes into contact with a pathogen?
A. The AVR proteins of the virus will not be able to bind and the plant will not become infected. B. The AVR protein will block the plant's basal resistance, allowing the pathogen to infect the cell. C. The AVR protein will activate the plant's defensive genes. D. The AVR protein will bind to a receptor in the plant cell's membrane and a general defense response will be triggered. E. The pathogen will not make AVR proteins if the plant cell lacks the R protein.
Mannitol salt agar is selective for Staphylococcus aureus because this organism
A. is often resistant to methicillin. B. can withstand high salt concentration. C. is unique in its ability to ferment mannitol. D. can tolerate brief exposures to high temperature. E. can synthesize catalase.
The tropics are warmer than the temperate regions because
A. they are at a higher altitude and closer to the sun. B. they are closer to the moon. C. there is less wind there to cool it. D. the sun's rays strike at a direct angle. E. the sun's rays strike at an oblique angle.
When two secondary oocytes are released from the ovaries and are fertilized by different sperm cells, what is the result?
A) clones B) identical twins C) conjoined twins D) fraternal twins