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Home Q & A Board Biology-Related Homework Help General Biology
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Luasene Luasene
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6 years ago
In DNA, the most important reason adenine does not ever pair up with cytosine is that:
 
  a. There is a size problem that prevents pairing.
  b. Adenine bonds with two hydrogen bonds, and cytosine bonds with threehydrogen bonds.
 c. Adenine bonds with three hydrogen bonds and cytosine bonds with two hydrogenbonds.
 d. Adenine can occasionally bond with cytosine.

Question 2

Hummingbirds' small size allows them to hover while extracting nectar from various flowers. This same small size requires large amounts of calories to maintain body temperature because
 
  a. the breeze from their flapping wings constantly cools them off.
  b. hummingbirds only eat at night.
  c. they have a large body mass relative to their surface area.
  d. hovering requires less energy than forward flight.
  e. they have a large surface area relative to their body mass.
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Lauraem32Lauraem32
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6 years ago
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Luasene Author
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#2
6 years ago
So that's it? I get an expert answer then we move on with our lives? Not too bad Smiling Face with Open Mouth
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