Describe the difference between an autocrine and paracrine action, and the difference between a hormone and a neurotransmitter.

Which method is used to remove DNA from a cell?

a) sequencing

b) PCR

c) fingerprinting

d) extraction

The following statements about the double-helical structure of DNA are correct EXCEPT

  1. It has adenine paired with thymine and cytosine paired with guanine
  2. It can assume many different forms including A-DNA, B-DNA, and Z-DNA
  3. In B-DNA, all the hydrogen-bonded base pairs lie in a plane perpendicular to the helix axis
  4. None of the above are correct

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