Answer: D
Explanation: The villi increases the surface area for food absortion. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials.
I believe the answer is B. they respond to stimulli
Answer:
This way, for 20^2.55 = 2109 amino acids are require to have 2*1056 number different sequences.
Explanation:
Protein should contain 2*1056 of different sequence so
2*1056 = 20^x
Log (2*1056) = log 20^x
3.3246 = (x ) * 1.3010
X= 2.555
Answer:
Most restriction enzymes recognize sequences of 20-25 bp in length
Explanation:
Sequences of DNA that are recognized by restriction enzymes are called recognition (or restriction) sites are usually are between 4 and 8 bases long. Many of them are palindromic, which means that they are the same when you read it backwards and forwards (mirror-like).
Restriction enzymes are endonucleases, which means they cut phosphodiiester bonds within DNA. These enzymes are from prokaryotic organisms (archea and bacteria) which use them as defending mechanism against viruses. Prokaryotes protect their own DNA via methylation, performed by methyltransferase.
Plants use and produce both oxygen and carbon dioxide.
