Covalent modification

A) can activate an enzyme.
B) affects the activity of an enzyme by adding or removing a chemical group.
C) can involve the addition of phosphate groups.
D) produces modifications that can sometimes be reversed.
E) all of the above


E) all of the above

Biology & Microbiology

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In a population of Mendel's garden peas, the frequency of dominant yellow-flowered plants is 50%. The population is in Hardy-Weinberg equilibrium. From this information alone, can you determine the allele frequencies (A = p and a = q)? Why or why not?

Fill in the blank with the appropriate word.

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Microphylls evolved from stem branches

____________________ Indicate whether the statement is true or false.

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If a tree has flower petals that are small and the same color as its leaves, it is likely to be pollinated by

a) the wind. b) butterflies. c) moths. d) bees. e) bats.

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The most common reportable disease in the United States is

A) cystitis. B) lymphogranuloma venereum. C) gonorrhea. D) syphilis. E) candidiasis.

Biology & Microbiology