At what phase in the cell cycle does DNA replication occur?
A) G0 B) S C) G1 D) M
B
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Free radicals, highly reactive species with unpaired electrons that damage molecules and cells, and can contribute to
aging. Coenzyme Q (also known as ubiquinone or CoQ) is often found in lotions and moisturizers. Given what you know about the role of CoQ in cellular respiration, why would it be added to these products?
a. It recruits free radicals to help increase the rate of glycolysis in skin cells. b. It absorbs free radicals that can cause damage to skin cells. c. Removing free radicals decreases the rate of metabolism and slows growth of skin cells. d. It allows for the regeneration of new skin cells. e. It drives the spontaneous death of older skin cells that have accumulated too many free radicals.
The __________ governs expression of three genes
active in lactose metabolism. Fill in the blank(s) with the appropriate word(s).
Describe the maternal age effect associated with Down syndrome
What will be an ideal response?
What is the molecule that brings amino acids to the ribosome to be bound together during translation?
A) messenger RNA (mRNA) B) transfer RNA (tRNA) C) ribosomal RNA (rRNA) D) leucine E) methionine