The nitrogenous base found in DNA but not in RNA is
a. adenine.
b. cytosine.
c. guanine.
d. uracil.
e. thymine.
e
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A(n) ________ is an instrument used to separate subcellular structures and macromolecules on the basis of size, shape, and density. ________ developed this instrument in Sweden during the period 1925–1930
Fill in the blank with correct word.
Invertebrates that have the camera-like eye of vertebrates include the __________
a. fly b. earthworm c. lobster d. snail e. octopus
Scientists investigating speciation in fruit flies divided a single population of flies into separate populations that each lived in their own cage on one of two food sources: maltose-based food or starch-based food. After several generations, the flies' mate preference was tested, and it was found that flies strongly preferred to mate with other flies that were raised on the same food source. This result suggests that
A. selection on reproductive isolating mechanisms indirectly led to the evolution of different food preferences. B. reproductive isolating mechanisms evolved primarily through genetic drift. C. selection on food source indirectly led to the evolution of reproductive isolating mechanisms. D. different food preferences evolved primarily through genetic drift.
What is a testcross?
A. any genetics cross you see on an exam B. a cross between two organisms of different species C. a cross between an organism of unknown genotype with a homozygous recessive individual D. any genetics cross you do in a lab or an abbey garden E. a cross between two true-breeding individual (such as we see in the P generation)