Select the phrases that apply to the sixth mass extinction.
A. human influenced
B. Cretaceous period
C. slow rebound of biodiversity
D. asteroid
Ans: A. human influenced
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Which of the following are adhesion proteins that are present in both choanoflagellates and animals?
A. actins B. pectins C. cadherins D. hemoglobins
The term used to describe bacteria that are rod-shaped is
A. vibrio. B. coccobacillus. C. coccus. D. bacillus.
Which of the following is false concerning stem
cells? a. They are undifferentiated cells. b. They arise from a fertilized egg. c. They can be coaxed to differentiate. d. They are obtained from a portion of a plant body. e. They may help mend damaged tissue.
What did Watson and Crick deduce about the three-dimensional structure of DNA?
A) There is a repeating pattern every 3.4 nm and every 0.34 nm. B) It is a double-stranded helix. C) It contains a lot of phosphorus. D) It is a large molecule. E) It consists of supercoiled chromatin.