Which of the following statements concerning nucleic acids is CORRECT?
A. Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates.
B. Cellular DNA is double stranded.
C. All viruses have DNA genomes.
D. The nucleic acid polymer is composed of peptide bonds.
E. There are three naturally occurring purines in nucleic acids.
Answer: B
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Glycolysis is a series of chemical reactions (endergonic and exergonic) by which the cell can obtain ATP. NAD+ plays a crucial role in the reactions of glycolysis by:
A. accepting electrons from glucose so that glucose gets partially oxidized to pyruvate. B. donating electrons to pyruvate when glucose gets partially oxidized. C. converting endergonic reactions to exergonic reactions so that there is an output of energy to make ATP. D. donating electrons to ADP to make ATP.
Consider the cladogram shown. Which pair of species shares the greatest number of derived characters (synapomorphies)?
A. 4 and 2
B. 5 and 4
C. 6 and 1
D. 6 and 2
E. 5 and 2
Populations have three basic types of dispersion patterns—clumped, random, and uniform. What situation supports random distributions?
A. When individuals of the populations do not interact strongly with one another. B. When individuals of the population are in competition for resources. C. When there is an even distribution of resources. D. When individuals of the population display social interactions.
The contraceptive pill works by
1.causing the endometrium to break down 2.preventing fertilization 3.preventing implantation of a fertilized egg 4.preventing ovulation