What occurs In both prokaryotic and eukaryotic tRNA maturation?
A. The pre tRNA molecule is trimmed by exo and endonucleases
B. The pre tRNA is spliced
C. The mature tRNA is capped at the 5' end
D. There is extensive RNA editing
A
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This is an example of which type of selection?
You are all excited because you just purchased a male guppy that has red, blue and green colors on its fins and tail. Your guppies at home do not have this combination of colors. You place the new male in with three females for mating purposes. After three weeks you have many new baby guppies and most of them have the new color combination. A. Natural. B. Environmental. C. Analogous. D. Convergent. E. Artificial.
The T2 bacteriophages used in the Hershey and Chase experiment are made of what?
a. DNA b. RNA and protein c. protein, phospholipid, and DNA d. DNA and protein e. protein, phospholipid, DNA, and RNA
Down syndrome
a. risk of occurring increases with the mother’s age. b. affects boys more than girls. c. individuals rarely live past 5 years old. d. individuals have normal organ and bone development but are mentally impaired. e. disorder in related to a monosomy of chromosome 21
Which of the following statements best summarizes natural selection?
A) Organisms evolve in order to become better adapted to the environment. B) Individuals who are most fit will survive. C) Traits that promote survival and reproduction become more frequent in species from one generation to the next. D) Organisms change in order to become adapted to new environments.