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EleoNora [17]
3 years ago
6

How would you test presence of starch in leaves??

Health
1 answer:
prisoha [69]3 years ago
8 0
Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
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Adenosine's relationship with caffeine is best described as: Group of answer choices There is no direct relationship between the
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Answer:

Competition on the same receptor binding site

Explanation:

Adenosine is a neuromodulator or chemical in nervous system that makes humans feel tired while caffeine act as adenosine antagonist of adenosine blocker that makes human feel fresh.

Adenosine and caffeine both binds to the same receptor and compete for the same binding site. When adenosine binds to its receptors, the neural activity slows down but when caffeine binds to the same receptor, it do not allow adenosine to bind the same receptor and do not slows down the neural activity.

Hence, the correct answer is "Competition on the same receptor binding site".

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How does the HaeIII enzyme discriminate between the C-G polymorphism in the TAS2R38 gene?
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Answer;

-HaeIII cuts at the sequence GG:CC which is found at nucleotide 143-146 of the TAS2R38 gene. A non-taster alley changes the sequence at position 145 from a C to a G. This makes the gene no longer recognized by the restriction enzyme.

Explanation;

-Restriction enzymes recognize and make a cut within specific palindromic sequences, known as restriction sites, in the genetic code. This is usually a 4- or 6 base pair sequence.

For example; HaeIII is a restriction enzyme that searches the DNA molecule until it finds this sequence of four nitrogen bases.

5’ TGACGGGTTCGAGGCCAG 3’

3’ ACTGCCCAAGGTCCGGTC 5’

Once the recognition site was found HaeIII could go to work cutting (cleaving) the DNA

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