DNA Structure and Base Pairing

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Questions and Answers

How many hydrogen bonds are formed between Cytosine and Guanine bases?

  • 4
  • 5
  • 3 (correct)
  • 2

What is the component of the DNA molecule that is shown in the diagram as 'H-C-H'?

  • Sugar molecule
  • Base pair
  • Deoxyribose (correct)
  • Phosphate group

Which of the following base pairs are joined by 2 hydrogen bonds?

  • T-C
  • A-T (correct)
  • A-G
  • C-G

What is the function of the phosphate group in the DNA molecule?

<p>To connect the sugar molecule to the base (B)</p> Signup and view all the answers

Which of the following is NOT a base pair in the DNA molecule?

<p>A-G (D)</p> Signup and view all the answers

What is the historical definition of a gene?

<p>A functional and physical unit of heredity (D)</p> Signup and view all the answers

What is the primary function of most genes?

<p>To contain the information for making a specific protein (C)</p> Signup and view all the answers

What is the composition of a gene?

<p>Pieces of DNA (A)</p> Signup and view all the answers

What is the relationship between a gene and its inheritance?

<p>A gene is passed from parent to offspring (C)</p> Signup and view all the answers

What is the term for a segment of DNA that codes for a protein?

<p>Exon (C)</p> Signup and view all the answers

What is the primary component of the DNA backbone?

<p>Sugar-phosphate (D)</p> Signup and view all the answers

Who discovered the structure of DNA?

<p>Watson and Crick (A)</p> Signup and view all the answers

What is the approximate number of base pairs in human DNA?

<p>3 x 10^9 (A)</p> Signup and view all the answers

What is the complementary base pair of adenine (A)?

<p>Thymine (T) (A)</p> Signup and view all the answers

What is the shape of the DNA molecule according to Watson and Crick's discovery?

<p>Double helix (D)</p> Signup and view all the answers

What is the primary role of genes?

<p>To possess and pass on a single characteristic (B)</p> Signup and view all the answers

Who is credited with introducing the concept of genes?

<p>Gregor Mendel (B)</p> Signup and view all the answers

What was initially thought to carry genetic information?

<p>Proteins (C)</p> Signup and view all the answers

What is the function of proteins in cells?

<p>To perform the majority of the reactions of life (C)</p> Signup and view all the answers

When was it discovered that DNA carries genetic information?

<p>In the mid-20th century (D)</p> Signup and view all the answers

What is a gene?

<p>A small region of a chromosome (A)</p> Signup and view all the answers

What are chromosomes composed of?

<p>Nucleotides (B)</p> Signup and view all the answers

What is the function of a gene?

<p>To synthesize proteins (D)</p> Signup and view all the answers

What is the genetic code composed of?

<p>A sequence of nucleotides (B)</p> Signup and view all the answers

What is the example of a gene given in the passage?

<p>ATGCTACTTCACTGA (C)</p> Signup and view all the answers

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