Which of the following is an example that results from directional selection?

A) The birth weight at which newborn humans are most likely to survive and the average weight of newborn humans are about the same.
B) There is an increase in antibiotic-resistant strains of bacteria.
C) There is an increase in the number of different breeds of dog.
D) Garter snakes with different coloration patterns behave differently when threatened.


B

Biology & Microbiology

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If you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities?

A) I B) II C) II or III D) IV E) either II or IV

Biology & Microbiology

Which one of the following is TRUE regarding knowledge gained through scientific investigation?

A) The knowledge can be used to prove or disprove religious beliefs. B) Scientific knowledge cannot be used to improve human life through technology. C) The information can be used to detect problems at an early stage and correct mistakes. D) Society as a whole generally ignores scientific information. E) The knowledge has resulted in less-efficient sources of energy yet better health care.

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In eukaryotes a series of ________ residues are added to the 3' end of an RNA molecule as part of the posttranscriptional processing used to produce functional mRNA.

A. guanine B. cytosine C. adenine D. uracil

Biology & Microbiology

The Krebs cycle requires 

A. a four-carbon acid. B. coenzyme A (CoA). C. an acetyl group (2C). D. All of these answers are true.

Biology & Microbiology