During elongation, RNA polymerase has three prominent channels, or grooves. These channels provide sites for all of the following EXCEPT _____
A) a site for the double-stranded DNA molecule
B) a site for the entry of ribonucleoside triphosphates
C) a site for the exit of the diphosphates removed from the nucleotide triphosphates
D) a site for the growing RNA strand
Answer: C
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The photosynthetic production of one molecule of glucose requires ________ molecule(s) of ATP.
A. 18 B. 12 C. 6 D. 24
Temperate grasslands and temperate deciduous forests are two different biomes that are located in the same latitudes. Which one of the following abiotic conditions is most likely to account for the differences in their community composition?
A. temperature B. precipitation C. sunlight D. soil nutrients E. a rain shadow
According to the logistic growth equation, = rmaxN,
A) the number of individuals added per unit time is greatest when N is close to zero. B) the per capita growth rate (r) increases as N approaches K. C) population growth is zero when N equals K. D) the population grows exponentially when K is small. E) the birth rate (b) approaches zero as N approaches K.
According to the threshold model, for a family in which a disorder occurs, the risk of the disorder
decreases as relatedness decreases. Indicate whether the statement is true or false.