7 4.2 The Structure of DNA Quiz

DNA stands for...

• Deoxyribose Acid

• Deoxynucleic Acid

• Deoxyribonucleic Acid

• Ribonucleic Acid

Answer explanation

DNA stands for Deoxyribonucleic Acid, which is the correct and full name. The other options are incorrect abbreviations or refer to different types of nucleic acids.

If one side of DNA is ATTA what would the complementary strand look like?

• CGGC

• GCCG

• TAAT

• ATTA

Answer explanation

The complementary base pairing in DNA means A pairs with T and T pairs with A. Therefore, for the strand ATTA, the complementary strand is TAAT.

Cystosine is always paired with ______________.

• Adenine

• Thymine

• Guanine

• It doesn't match with anything

Answer explanation

Cytosine pairs with Guanine in DNA. This base pairing is crucial for the structure of DNA, where Adenine pairs with Thymine, and Guanine pairs with Cytosine, ensuring proper genetic coding.

The sides of DNA contain

• Sugar and phosphate

• Sugar and base pairs

• Phosphate and base pairs

• DNA does not have any sides

Answer explanation

The sides of DNA are composed of alternating sugar and phosphate molecules, forming the backbone of the DNA structure. This is why the correct answer is 'Sugar and phosphate'.

The shape of DNA looks like a twisted ladder, known as

• helicase

• a double helix

• a triple helix

Answer explanation

The shape of DNA is described as a double helix, which resembles a twisted ladder. This structure consists of two strands that coil around each other, making 'a double helix' the correct answer.

If one side of DNA is TTGAC what is it's complementary strand

• AACTG

• TTGAC

• GGCGT

• TTCAC

Answer explanation

The complementary base pairing in DNA means A pairs with T and G pairs with C. For the strand TTGAC, the complementary bases are AACTG, making AACTG the correct answer.

Where is DNA found in the cell?

• Mitochondria

• Ribosomes

• Nucleus

• Endoplasmic Reticulum

Answer explanation

DNA is primarily found in the nucleus of the cell, where it is organized into chromosomes. While mitochondria also contain DNA, the nucleus is the main location for genetic material.

Guanine bonds with ______________.

• Adenine

• Guanine

• Cytosine

• Thymine

Answer explanation

Guanine pairs with Cytosine in DNA through three hydrogen bonds, ensuring proper base pairing. Adenine pairs with Thymine, while Guanine does not bond with itself.

Why is DNA important?

• it is very small and very complicated

• it's in everything

• it serves as the blueprint for traits of all living things

• because we eat it every day for energy

Answer explanation

DNA is crucial because it serves as the blueprint for traits of all living things, determining how organisms develop and function. This makes it fundamental to biology, unlike the other options which are incorrect.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

Which of these is NOT in DNA?

• Adenine

• Thymine

• Guanine

• Uracil

• Cytosine

Answer explanation

Uracil is not found in DNA; it is a component of RNA. DNA contains adenine, thymine, guanine, and cytosine as its nitrogenous bases.