Terry saved some of the tooth-like objects within the hagfish's round mouth to analyze their composition in his mentor's biochemistry research lab. Terry will find that they are composed of the same protein found in tetrapod _____
A) skin
B) teeth
C) bones
D) cartilage
A
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You are studying an ecosystem on your campus. After a solid base of carefully observed and described facts, your
next step would be to ____.
a. make more observations b. make a hypothesis c. share your data with others d. wait for instructions e. design an experiment
If 35% of the bases in a region of the mouse genome are cytosine, what percentage in that region are adenine?
A) 15% B) 20% C) 30% D) 35% E) cannot be determined
Which of the following is true about mutations?
A. Mutations are changes in the nucleotide sequence of DNA. B. Mutations are always detrimental to the health of the organism. C. Mutations always involve a change in the resulting protein. D. Mutations are always caused by mutagens, including radiation, chemicals, or viruses.
Swallow bugs cause nest failures and juvenile mortality. As colony size increases, the costs to cliff swallows are
a. increased juvenile mortality. b. decreased juvenile mortality. c. decrease in the number of unhatched eggs. d. a change in daily survival probability.