According to scientists, about what percentage of men currently living in Central Asia may be descended from the Mongolian ruler Genghis Khan?
A) 4%
B) 8%
C) 25%
D) 40%
Answer: B
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What is the complementary DNA strand to 5?-ATTCGGTGA-3??
A. 3?-CGGATTGTC-5? B. 5?-TAAGCCACT-3? C. 3?-ATTCGGTGA-5? D. 5?-CGGATTGTC-3? E. 3?-TAAGCCACT-5?
Which of the following are examples of amplification of a hormone signal?
I) Epinephrine initiates an enzyme cascade. II) Steroids bind hormone-response elements in the cell and initiate transcription of many genes. III) A quantity of 0.09 mg of growth hormone leads to a 10,000-mg weight gain in a cow. IV) Different cell types have different receptors capable of binding the same hormone. A) only I and III B) only II and IV C) only I, II, and III D) only II and III E) I, II, III, and IV
Examine this pedigree that shows segregation of Huntington disease and the DNA marker G8. What was the most likely genotype of individual V-3 at the DNA marker?
A) BC
B) AB
C) CC
D) AC
E) All of the possible genotypes are equally likely.
The Gram stain separates bacteria based on _________.
A) the charge of the cell (either positive or negative) B) the presence or absence of nuclei C) differences in the structure of the cell wall