Answer:
Then it hits the lens and then the retina
Explanation: The light that is let in decides the size of the pupil
Answer:
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Explanation:
Probably Dangerous ....................
Watson and Crick determined base pairing by using Chargaff's rule to fit the bases together.
<h2>Further Explanation
</h2>
- Watson and Crick discovered that the DNA strands exists as a double helix, which appears like a twisted ladder.
- In doing so, Watson and Crick used the Chargaff’s rule to confirm the base pairing in the double stranded DNA, so as to fit the complementary bases together.
<h3>Structure of DNA</h3>
- DNA is a nucleic acid that carries genetic material in all living organisms. DNA is a double stranded nucleic acid whose building blocks are known as nucleotides.
- Each nucleotide contains a sugar, a phosphate group and a nitrogenous base. The four nucleotide bases found in the DNA are Adenine, Cytosine, Thymine and Guanine.
- The strands of DNA are attached to each other as a result of base pairing that occurs through hydrogen bonding as explained by Chargaff’s rule.
<h3>Chargaff’s rule.
</h3>
- Chargaff’s rule describes the base pairing in a DNA molecule, such that the base Guanine pairs with the base Cytosine in the complementary strand, while the base Adenine pairs with Thymine.
- This means the number of thymine bases in a DNA molecule will be equal to the number of Adenine bases, while Guanine bases will be equal to Cytosine bases.
- The result is a ratio of 1:1 between pyrimidines and purines in a molecule of DNA.
- Chargaff's rule of base pairing provided Watson and Crick with a prove that their model was correct, since it agreed with Chargaff's as far as the percentages of A,T,G, and C in DNA are concerned.
- According to Watson and Crick model, the hydrogen bonds could only form between adenine and thymine, and between cytosine and guanine to create an almost perfect fit.
Keywords; Watson and crick model, Chargaff’s rule, DNA, and base pairing.
<h2>Learn more about;
</h2>
- DNA and its structure; brainly.com/question/6460381
- Watson and crick model; brainly.com/question/1462835
Level; High school
Subject; Biology
Topic; Nucleic acids
Sub-topic: DNA structure and base pairing.
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