Two strands of DNA that have been cut by an endonuclease can be sealed together by a(n)
A. methylase enzyme.
B. protease enzyme.
C. polymerase enzyme.
D. ligase enzyme.
E. exonuclease enzyme.
Answer: D
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Based on this information, is herbicide resistance an adaptation in this population?
a. Because it gives organisms an advantage in terms of survival and reproduction when herbicides are sprayed, it would be considered an adaptation. b. Because plants that don’t have herbicide resistance produce more offspring, it would not be considered an adaptation. c. Selection pressures vary with the environment, so this trait would be considered an adaptation in certain environments. d. Because this trait is only advantageous in certain environments, it would not be considered an adaptation
What limits the length of a food chain? What will be an ideal response?
The above figure is a photograph of
a. plant with root nodules. b. mycorrhizae. c. root hairs. d. demonstration of the effect of mutualistic Rhizobium. e. a nodule forming around area where the bacterium infect.
The receptor potential is the
A) membrane potential produced when a neurotransmitter molecule binds to its receptor. B) membrane potential produced in the receptor cell by sensory transduction. C) electrical signal produced by an action potential. D) membrane potential produced at a muscle cell.