Which of the following statements regarding enzymes is true?
a. Enzymes are permanently altered by the reactions they catalyze.
b. Enzymes only work on endergonic reactions.
c. Enzymes alter the chemical composition of the products of a reaction.
d. Enzymes increase reaction rates.
e. Enzymes prevent changes in substrate concentrations from having an effect on reaction
rate.
D
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a. coelom b. colon c. notochord d. mouth e. anus
Genetic drift is a random process that can change the genetic structure of a population Indicate whether the statement is true or false
In sponges, spicules are secreted by amoeboid cells
____________________ Indicate whether the statement is true or false.
Which statement is true of DNA's structure?
A. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. B. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. C. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. D. When adenine base pairs with thymine, they are linked by three hydrogen bonds. E. All four bases in DNA can be found in equal quantities.