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Structure of DNA Molecules

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Questions and Answers

What type of sugar is found in the structure of DNA?

Sucrose
Deoxyribose (correct)
Ribose
Glucose

Which of the following correctly describes the orientation of the DNA strands?

Both strands run in the same direction
The strands run in opposite directions (correct)
Both strands are twisted clockwise
The strands run parallel to each other

Which base pairs with adenine in DNA?

Uracil
Guanine
Thymine (correct)
Cytosine

How are nucleotides in a DNA chain connected?

<p>By bonds between 3' and 5' carbons of sugars (C)</p> Signup and view all the answers

What would be the complementary DNA sequence for the strand GTCA?

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

Flashcards

What is a nucleotide?

A nucleotide is the basic building block of DNA, composed of a sugar (deoxyribose), a phosphate group, and a nitrogenous base.

How are nucleotides connected in a DNA chain?

Nucleotides are linked together in a chain by bonds between the 3' carbon of one sugar and the 5' carbon of the next sugar.

What are the four bases in DNA?

The four nitrogenous bases in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T).

How does DNA form a double helix?

Two DNA strands twist around each other to form a double helix, with the bases from one strand pairing with bases from the other strand.

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What are the base pairing rules in DNA?

Adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C).

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Study Notes

Structure of DNA Molecules

DNA is a double helix made of two polynucleotide chains.
The chains run antiparallel to each other.
The bases pair in a complementary way (A with T, and G with C).
The sequence of bases in one chain dictates the sequence in the other chain.

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Description

This quiz explores the fundamental structure of DNA molecules, highlighting the double helix formation, base pairing, and the antiparallel nature of the DNA strands. Test your knowledge on how the arrangement of nucleotides influences genetic information.