Which body system is directly responsible for protecting an animal from disease?
a) circulatory system
b) immune system
c) nervous system
d) endocrine system
Ans: b) immune system
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Which of the following is part of the maturation of a eukaryotic mRNA?
1.removal of introns 2.the linking of exons 3.addition of the 5‘ cap 4.addition of the poly A tail 5.All of the options are correct.
A wilted flower placed in a vase of water for several hours became stiff and stood erect. When it was placed in a salt
solution, it wilted. From this information, we can say that the cells of the flower are:a. hypotonic to both fresh water and the salt solution. b. hypertonic to both the fresh water and the salt solution. c. hypertonic to fresh water but hypotonic to the salt solution. d. hypotonic to fresh water but hypertonic to the salt solution. e. isotonic to fresh water but hypotonic to the salt solution.
Bioremediation uses microbes to
A.) break down food B.) clean up pollutants C.) convert atmospheric nitrogen D.) produce carbohydrates
Archaea and bacteria diverged:
a. before archaea and eukarya diverged. b. after archaea and eukarya diverged. c. when archaea and eukarya diverged. d. after bacteria and eukarya diverged. e. before bacteria and eukarya diverged.