Mutations occur ________ with respect to fitness
Fill in the blank with the appropriate word.
ANS:
randomly
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DNA is believed to have replaced RNA as the main information molecule because _____
a. DNA contains thymine and RNA does not. b. DNA is double-stranded and breaks less easily. c. DNA can store more protein-building instructions in less space. d. RNA can also function as an enzyme. e. RNA can regulate gene expression.
Blood containing metabolic waste is transported to the kidneys by the renal vein; the renal artery removes blood from the kidneys once the waste has been removed
Indicate whether the statement is true or false
In DNA
a. G pairs with T and A pairs with C. b. G pairs with A and C pairs with T. c. G pairs with C and A pairs with T. d. G pairs with C and U pairs with A.
Resident flora of the intestines include
A. Bacteroides. B. Haemophilus. C. Staphylococcus. D. Streptococcus. E. All of these choices are correct.