In an aquatic microbial community where a photoautotroph, chemoorganoheterotroph, and nitrogen fixing bacterium are present, predict an environmental perturbation that would cause only one to be outcompeted by the other two groups and explain how each group would respond
What will be an ideal response?
Answer: Answers will vary but should highlight a unique feature of one of the groups such as: photoautotrophs are sensitive to photon (light) availability, chemoorganoheterotrophs require organic molecules for carbon, and nitrogen fixing bacteria use N2 gas.
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Consider a cell in which nondisjunction occurs for all chromosomes during meiosis I. What would be the result of this event?
A. two aneuploid gametes, each with an extra set of chromosomes B. two haploid gametes and one aneuploid gamete with an extra set of chromosomes C. four aneuploid gametes D. four haploid gametes E. two haploid gametes and two polyploidgametes
The human vocal cords are located in the:
a. glottis b. pharynx c. trachea d. larynx e. bronchus
One of the most common causes of intellectual disability in the United States is ____
a. congenital rubella syndrome b. cocaine addiction c. fetal alcohol syndrome d. the use of thalidomide by pregnant women e. the use of tetracycline by pregnant women
What is required to stop transcription in prokaryotes?
a. a stop codon b. an enzyme c. an RNA hairpin loop d. a poly-A sequence