1.1a Structure of DNA Flashcards

1
Q

What is DNA?

A

Deoxyribonucleic Acid -
Double stranded molecule held together by complementary bases that provides instructions for protein synthesis (sequence of bases corresponds with the sequence of amino acids in protein synthesised)

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2
Q

What is the structure of DNA?

A

Double stranded helix and antiparallel structure made up nucleotides with a sugar-phosphate backbone and held together by complementary base pairs (by hydrogen bonds)

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3
Q

What is the structure of a nucleotide?

A

A nucleotide consists of a deoxyribose sugar, a phosphate and a base.

The base is attached to the first carbon and the phosphate to the fifth carbon of the deoxyribose sugar.

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4
Q

What are the four bases in DNA?

A

Adenine (A)
Thymine (T)
Cytosine (C)
Guanine (G)

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5
Q

What holds the bases of different nucleotides together?

A

Weak hydrogen bonds

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6
Q

How are nucleotides joined together on the DNA strand?

A

Strong chemical bonds between the deoxyribose sugar (3’ end) of one nucleotide and the phosphate of another.

These links form the sugar-phosphate backbone of the DNA molecule.

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