GCSE Biology - What is DNA? (Structure and Function of DNA) #65

The video tutorial covers the structure of DNA, focusing on nucleotides and complementary base pairing. It explains the double helix structure, the components of nucleotides, and how they form polymers. The concept of complementary base pairing is detailed, showing how DNA strands pair. The tutorial concludes with an overview of how genes code for proteins, describing the genetic code, triplet codons, and the process of protein synthesis.

What is the shape of DNA commonly referred to as?

• Single Helix

• Double Helix

• Quadruple Helix

• Triple Helix

Which part of the nucleotide varies among the four types?

• Phosphate

• Sugar

• Base

• Backbone

What forms the sugar-phosphate backbone in DNA?

• Sugars and Phosphates

• Phosphates and Bases

• Bases and Sugars

• Bases and Nucleotides

Which base does adenine (A) pair with in DNA?

• Cytosine (C)

• Guanine (G)

• Thymine (T)

• Adenine (A)

What is the complementary sequence for the DNA strand AGT?

• TCA

• GCA

• TGC

• CGA

What is a triplet code in DNA responsible for?

• Coding for a base

• Coding for a phosphate

• Coding for a sugar

• Coding for an amino acid

What is the primary function of enzymes in the body?

• To store genetic information

• To carry messages

• To speed up chemical reactions

• To add strength to tissues