In a test tube, a particular DNA polymerase has an error rate of 1 mistake in every 106 bases copied. Why is the mutation rate in a cell that uses this DNA polymerase much lower?
A) The polymerase is more careful in replicating regions where genes exist.
B) Repair mechanisms correct errors made by the polymerase.
C) Not all mutations can be detected easily.
D) The DNA polymerase has no proofreading function.
E) Mutations do not occur if mutagens are not present.
B) Repair mechanisms correct errors made by the polymerase.
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In a simple synapse, neurotransmitter chemicals are received by _____
A) the postsynaptic membrane B) the presynaptic membrane C) axon hillocks D) cell bodies E) ducts on the smooth endoplasmic reticulum
Which scientist(s) was/were awarded a Nobel prize 50 years after discovering viral oncogenesis?
A) Rous B) Epstein and Barr C) Burkitt D) Folkman E) Kaposi
According to the figure, what is a likely day of implantation?
A. Day 3
B. Day 27
C. Day 13
D. Day 21
E. Day 7
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about implantation? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which type of lipid is composed of long-chain fatty acids attached to long-chain alcohols?
a. triglycerides b. phospholipids c. sterols d. waxes e. most neutral fats