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cheo8907 cheo8907
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7 years ago
The water vascular system of the sea star ________.
 
  a. is based on ampullae inside each of the tube feet, which contract to lengthen the foot for locomotion
 b. is a simple digestive system that expels coarse, undigested residues through the mouth
 c. is an open circulatory system
 d. flushes millions of eggs from the gonad

Question 2

What is the natural function of restriction endonucleases?
 
  a. research applications
  b. DNA manipulation in vitro
  c. defense against viruses that infect bacteria
  d. regulating bacterial gene expression
  e. breaking phosphodiester bonds in mammalian DNA
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Replies
wrote...
7 years ago
Answer to q. 1

a

Answer to q. 2

C
cheo8907 Author
wrote...
7 years ago
Thank you
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