When DNA fragments from different sources are mixed together, they begin combining with each other due to
A) complementary base pairing.
B) the action of restriction enzymes.
C) a change in pH.
D) electrical currents present in the mixture.
E) a change in temperature.
A
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Destiny has distal symphalangism - her fingers and toes are stiff, with tiny nails. She looks it up and finds it is an autosomal dominant trait. Since her parents do not have it, she reasons that she has a new mutation. However, if she has children, each of them, assuming her partner does not have the condition, has a(n) ________ probability of inheriting the condition.
A) 1/8 B) 1/4 C) 1/2 D) 0
Plants open their stomata to obtain
a. carbon dioxide from air. b. oxygen from air. c. sugar from the roots. d. water from air
Which one of the following is an occasional severe complication of chickenpox?
a) Reye's syndrome b) Toxic shock syndrome c) Scalded skin syndrome d) Herpes encephalitis
Your friend has never gardened before. When none of the seeds he planted germinate, he asks you to suggest why. Which is the best explanation of what occurred?
A. Seeds take more than one season to germinate. B. The suspensor failed to develop into an embryo within each seed. C. All seeds require fire in order to germinate. D. The monocot seeds he used were only able to produce a single cotyledon each. E. The seeds were planted too deeply and used up their reserves before reaching the surface and sunlight.