Several new materials have been developed for use in the microbiology lab. These materials must be sterilized before use, but cannot withstand a temperature over 60oC and can't be exposed to water. Which method of sterilization would be applicable?
A. Oven-dry heat
B. UV radiation
C. Steam autoclave
D. Ionizing radiation
Answer: D
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How does a prokaryotic cell differ from a eukaryotic cell?
a. A prokaryotic cell has no membrane-enclosed organelles. b. A prokaryotic cell has a plasma membrane. c. A prokaryotic cell contains organelles. d. A prokaryotic cell has a nucleus. e. A prokaryotic cell has DNA.
The gastrointestinal tract has both a long tube that nutrients traverse from mouth to anus and accessory organs that aid in food digestion. From the following list of organs in the digestive system, identify the mismatch.
A. Salivary glands; accessory organ B. Pharynx; part of the digestive tube C. Rectum; part of the digestive tube D. Liver; part of the digestive tube E. Appendix; accessory organ
Sexual reproduction leads to offspring that are all genetically different from one another and from either parent. What are the three aspects of sexual reproduction that lead to this variation?
a) shuffling and reassortment of homologues during mitosis; shuffling and reassortment of homologues during meiosis; and combination of alleles from two parents at fertilization. b) crossing over during the production of zygotes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents at fertilization. c) crossing over during the production of gametes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents during binary fission. d) crossing over during the production of gametes; shuffling and reassortment of homologues during mitosis; and combination of alleles from two parents at fertilization. e) crossing over during the production of gametes; shuffling and reassortment of homologues during meiosis; and combination of alleles from two parents at fertilization.
An infection that does not cause any signs of disease is a/an __________.
A) secondary infection B) endemic infection C) inapparent infection D) sporadic infection