You uncovered a fossil that you suspect is around 100 million years old. Which of the radioisotope pairs in the table below could you eliminate as an appropriate choice for radioisotope dating the accompanying rock?
A. Potassium-40/Argon-40 (half-life = 1.3 billion years; useful dating range =100,000-4.5 billion years).
B. Rubidium-87/Strontium-87 (half-life = 47 billion years; useful dating range = 10 million-4.5 billion years).
C. Uranium-235/Lead-207 (half-life = 710 million years; useful dating range = 10 million-4.5 billion years).
D. Carbon-14/Nitrogen-14 (half-life = 5,730 years; useful dating range = 100-50,000 years).
E. Uranium-238/Lead-206 (half-life 4.5 billion years; useful dating range = 10 million-4.5 billion years).
D. Carbon-14/Nitrogen-14 (half-life = 5,730 years; useful dating range = 100-50,000 years).
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If you were to completely digest this fragment of DNA with PstI, how many pieces of DNA would you obtain?
A 6.85 kb EcoRI fragment of DNA is shown below. The location of several restriction sites is indicated. Scale is approximate.
A. 1
B. 2
C. 3
D. 4
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about restriction enzymes?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Endocytosis and exocytosis are mechanisms of ______ transport
Fill in the blank(s) with the appropriate word(s).
Refer to Figure 31-2. The structure labeled 5 is used for:A
food intake.
B. digestion.
C. locating food.
D. coordination of movement.
E. locomotion
Members of this group have a crystalline rod in their flagella
a. zooxanthellae b. ciliates c. euglenoids d. water molds e. diatoms