Eukaryotic mRNA contain non-coding regions called
A) introns.
B) exons.
C) transposons.
D) transcriptons.
Ans: A) introns.
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Several micronutrients such as manganese and molybdenum are important as:
A. minerals used in plant membranes B. minerals found mostly in cell walls C. minerals that are cofactors in certain cell reactions D. minerals that bond to macronutrients E. minerals that are so small it is impossible to determine their role
Toxic elements such as mercury are found in
the human body because a. of contamination from the environment. b. trace amounts of these elements have vital biological functions. c. they are needed to kill bacteria. d. they may be ingested with food but inactivated by cells. e. in small amounts they are biologically inactive and tolerated by cells.
What does the curvy line on the above graph represent?
a) Average amount of rainfall on the Galapagos Islands. b) The average beak size of Galapagos finches. c) The diet of the Galapagos finches. d) The number of wet and dry years. e) The average number of droughts.
When cloning Dolly, in order to encourage the plasma membranes of the two cells to become leaky so that the contents of the mammary cell passed into the egg cell, researchers applied
A. several methyl groups. B. an electrical shock. C. adeno-associated viruses. D. DOPA.