What are the consequences of lesion bypass?
What will be an ideal response?
Ans: First, when the replication complex stalls at a lesion, the polymerase must be removed and replaced by an error-prone polymerase. Second, when the damage has been bypassed, the repair polymerase must be removed and the replication complex reinserted.
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How much energy is ultimately converted into chemical energy by photosynthesis?
a. less than 1% b. 1-2% c. 5% d. 10% e. 20%
Jaws and paired fins evolved in early __________. Fill in the blank(s) with the appropriate word(s)
Cardiac muscle cells
a. do not contract by a sliding filament mechanism. b. are similar to those of smooth muscle in being nonstriated. c. have fewer mitochondria than skeletal muscle cells do. d. possess numerous gap junctions on their sides, favoring rapid spread of excitation. e. have intercalated disks with tight junctions at their branching ends.
The presence of ____ distinguishes eukaryotes from prokaryotes?
a. plasma membrane b. ribosomes c. nucleus and membrane bound organelles d. genetic material