Which of the following is a neural tube defect that involves incomplete development of the brain and results in stillbirth or death shortly after birth?
A) neurulation B) spina bifida C) anencephaly D) morphogenesis
Answer: C
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Opsonizing antibodies are those that function by:
a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.
A microbe is discovered growing near a deep sea thermal vent. When researchers bring a sample up to the surface and try to grow it in a lab at room temperature in a normal incubator, they are unsuccessful. Why?
A. The pressure isn't the same at sea level as it is on the ocean floor. B. Oxygen concentrations are very different between the two environments-it's possible the microbe is a strict anaerobe and is poisoned by the air (oxygen) in the lab. C. Salt concentrations might be different in the media the researchers are attempting to use and the salt water the microbe is used to living in. This might be causing osmotic pressure differences that the microbe can't tolerate. D. The temperature is probably different-the thermal vent would be very hot, while these researchers are trying to grow this microbe at room temperature. The enzymes in the cells are probably outside of their normal operating range at room temperature, and therefore nonfunctional. E. All of the above.
Which part of a fungus penetrates inside of a plant?
A. hyphae B. fruiting bodies C. spores D. pili E. flagella
Many identical copies of genes cloned in bacteria are produced as a result of _____
A) plasmid replication B) bacterial cell replication C) transformation D) plasmid and bacterial cell replication