The primary pigment molecule needed for photosynthesis is
A. carotenoid.
B. chlorophyll b.
C. glucose.
D. carbon dioxide.
E. chlorophyll a.
E. chlorophyll a.
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One of the DNA-binding motifs in many eukaryotic organisms that contains a nearly identical sequence of 60 amino acids is known as the
A. non-helical zipper. B. leucine zipper. C. zinc finger. D. homeodomain. E. helix-turn-helix.
The pathogen that causes Legionnaires' pneumonia also causes a milder infection called Pontiac fever.
Answer the following statement true (T) or false (F)
Which of the following is not associated with mass extinctions?
a. After mass extinctions new species evolve to replace others. b. Mass extinctions do not affect species randomly. c. Species living in isolated areas are more susceptible to extinction. d. Mass extinctions take place over a very long geologic period of time. e. Although new species may evolve, it will take millions of years to replace the losses of a mass extinction.
Which procedure is used to amplify DNA in the laboratory?
a. DNA cloning b. reverse transcription c. nucleic acid hybridization d. DNA restriction e. polymerase chain reaction (PCR)