What is an alternative to RNA as the first polymer of life?
a. single nucleotides
b. non-genetic polymers
c. polymers that do not form a double helix
d. other genetic polymers containing different sugars
e. other genetic polymers containing different amino acids
ANSWER: d
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Which of the following is directly involved in removing Spo11 that is covalently bound to the 5'-ending strand during meiosis?
A. RPA B. ExoI C. Rad50 D. Sgs1 E. Dmc1
Hemophilia A is an X-linked blood clotting disorder. A normal man and a woman with hemophilia A have a child with Turner Syndrome. This child does not have hemophilia. In whom did non-disjunction occur? In meiosis I or meiosis II?
A. Woman; meiosis I B. Woman; meiosis II C. Man; meiosis I D. Man; meiosis II E. Woman; there is not enough information to tell if the nondisjunction happened in meiosis I or II
Eutrophication can be caused by excess accumulation of in a body of water.
A. phosphorus B. nitrogen or phosphorous C. carbon D. nitrogen or carbon E. nitrogen
Which of the following organic compounds is the main source of energy for living things?
a) carbohydrates b) lipids c) nucleic acids d) proteins