25 Questions
How many hydrogen bonds are formed between Cytosine and Guanine bases?
3
What is the component of the DNA molecule that is shown in the diagram as 'H-C-H'?
Deoxyribose
Which of the following base pairs are joined by 2 hydrogen bonds?
A-T
What is the function of the phosphate group in the DNA molecule?
To connect the sugar molecule to the base
Which of the following is NOT a base pair in the DNA molecule?
A-G
What is the historical definition of a gene?
A functional and physical unit of heredity
What is the primary function of most genes?
To contain the information for making a specific protein
What is the composition of a gene?
Pieces of DNA
What is the relationship between a gene and its inheritance?
A gene is passed from parent to offspring
What is the term for a segment of DNA that codes for a protein?
Exon
What is the primary component of the DNA backbone?
Sugar-phosphate
Who discovered the structure of DNA?
Watson and Crick
What is the approximate number of base pairs in human DNA?
3 x 10^9
What is the complementary base pair of adenine (A)?
Thymine (T)
What is the shape of the DNA molecule according to Watson and Crick's discovery?
Double helix
What is the primary role of genes?
To possess and pass on a single characteristic
Who is credited with introducing the concept of genes?
Gregor Mendel
What was initially thought to carry genetic information?
Proteins
What is the function of proteins in cells?
To perform the majority of the reactions of life
When was it discovered that DNA carries genetic information?
In the mid-20th century
What is a gene?
A small region of a chromosome
What are chromosomes composed of?
Nucleotides
What is the function of a gene?
To synthesize proteins
What is the genetic code composed of?
A sequence of nucleotides
What is the example of a gene given in the passage?
ATGCTACTTCACTGA
Test your knowledge of the DNA double helix structure and the base pairing rules. Learn about the bonding between adenine, guanine, cytosine, and thymine. Understand the role of phosphate groups and hydrogen bonds.
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