What types of repeats are associated with insertion sequences (IS DNA), and where are they located?
What will be an ideal response?
Ans: An IS sequence has two short inverted terminal repeats at both ends and two direct repeats of the target sequence; insertion of the IS causes the direct duplication of the target sequence.
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A scientist found an unweathered igneous rock that contained 0.025 g of potassium-40 and 0.075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. Using the table from figure 22.8 the age of the rock would be estimated to be
A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.
Four of the five features listed below are
characteristic of adult sea stars. Select the exception. a. spiny skin b. tube foot c. water-vascular system d. bilateral symmetry e. ampulla
Which of these best describes Type II survivorship?
A) There is high survivorship for the very young. B) Most individuals survive to older age intervals. C) Survivorship is constant over the lifespan. D) Survivorship is high for the few individuals that survive to a certain age.
New world monkeys have all of the following features except
A. they have flat spreading noses. B. they evolved in isolation in South America. C. they are all arboreal. D. they grasp objects with long prehensile tails. E. they have ischial callosities (thickened rump pads).