In transcription, the base thymine in DNA will pair opposite the base ____ in mRNA.
A. uracil
B. guanine
C. cytosine
D. adenine
D. adenine
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Further evolution of the protostomes changed the coelom by
a. losing it. b. reducing it. c. it becoming a pseudocoel. d. all of the above.
How many pairs of ribs do humans have?
a. 6 b. 8 c. 10 d. 12 e. 14
Fruit-fly eyes are of the compound type, which is structurally very different from the camera-type eyes of mammals. Even the camera-type eyes of molluscs, such as octopi, are structurally quite different from those of mammals
Yet, fruit flies, octopi, and mammals possess very similar versions of Pax-6. The fact that the same gene helps produce very different types of eyes is most likely due to _____. A) the few differences in nucleotide sequence among the Pax-6 genes of these organisms B) variations in the number of Pax-6 genes among these organisms C) the independent evolution of this gene at many different times during animal evolution D) differences in the control of Pax-6 expression among these organisms
Which environmental condition is least likely to select for an iteroparous life-history strategy?
A. High adult survival rates B. very long life spans C. low rates of population increase D. early reproduction E. young that require parental care