Which of the following statements is true of cyclin-dependent kinases? o o o o o they regulate the cell cycle by phosphorylating other proteins they serve as receptors in signal-transduction pathways. they bring about apoptosis within cancer cells. they add methyl groups to histone proteins to assist in gene regulation. they speed up the cell cycle and cause abnormal cell proliferation. which of the following statements is true of cyclins? o o o o o the levels of cyclin oscillate during the course of the cell cycle. they add methyl groups to histone proteins to assist in gene regulation. they regulate the cell cycle by phosphorylating other proteins. they normally speed up the cell cycle and cause abnormal cell proliferation. they function via an intracellular domain to which a signaling molecule can bind.

They regulate the cell cycle by phosphorylating other proteins

Explanation:

they are serine-threonine kinases, they play an important role in the phosphorylation of other proteins. Cyclin-CDK complexes phosphorylate substrates appropriate for a particular cell cycle phase and without that, the cycle cannot continue.

b.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.