DNA and RNA Structure

DNA and RNA Structure

9th Grade

15 Qs

quiz-placeholder

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DNA and RNA Structure

DNA and RNA Structure

Assessment

Quiz

Biology

9th Grade

Medium

NGSS
HS-LS1-1

Standards-aligned

Created by

Alaina Gresh

Used 4+ times

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Which of the following best describes a DNA molecule?

double helix

contains ribose

made of amino acids

contains Uracil

Answer explanation

A DNA molecule is best described as a double helix, which consists of two intertwined strands. It does not contain ribose (which is in RNA), is not made of amino acids, and does not contain uracil (which is also in RNA).

Tags

NGSS.HS-LS1-1

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following units are repeatedly joined together to form a strand of DNA?

amino acids

nucleotides

fatty acids

polysaccharides

Answer explanation

DNA strands are formed by the repeated joining of nucleotides, which are the building blocks of DNA. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base, making them essential for DNA structure.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Guanine bonds with ______________.

Adenine

Guanine

Cytosine

Thymine

Answer explanation

Guanine pairs with Cytosine in DNA through three hydrogen bonds, making them complementary bases. Adenine pairs with Thymine, while Guanine does not bond with itself.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which 2 molecules form the sides (backbone) of the DNA ladder?

deoxyribose sugar and adenine

deoxyribose sugar and a hydrogen bond

deoxyribose sugar and the nucleus

deoxyribose sugar and phosphate

Answer explanation

The sides of the DNA ladder are formed by deoxyribose sugar and phosphate. These components create the sugar-phosphate backbone, while the nitrogenous bases, like adenine, form the rungs of the ladder.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What are the three components of a nucleotide?

sugar, hydrogen, nitrogen base

sugar, oxygen, nitrogen base

sugar, phosphate, nitrogen base

sugar, phosphate, protein

Answer explanation

A nucleotide consists of three components: a sugar molecule, a phosphate group, and a nitrogen base. The correct answer is 'sugar, phosphate, nitrogen base', as the other options include incorrect components.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The following picture must be

DNA because it's double stranded

RNA because it's single stranded

DNA because it's single stranded

RNA because it's double stranded

Answer explanation

The correct answer is 'RNA because it's single stranded' as RNA typically exists as a single strand, while DNA is double stranded. This distinction is key in identifying the type of nucleic acid depicted.

Tags

NGSS.HS-LS1-1

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What four nitrogen base pairs make up RNA?

Adenine, Thymine, Guanine, Cytosine

Adenine, Uracil, Guanine, Cytosine

Adenine, Thymine, Glucose, Cytosine

Adenine, Thymine, Guanine, Fructose

Answer explanation

RNA is composed of four nitrogen bases: Adenine, Uracil, Guanine, and Cytosine. Unlike DNA, RNA contains Uracil instead of Thymine, making the correct answer 'Adenine, Uracil, Guanine, Cytosine'.

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