DNA and The Genetic Code

Which of the following molecules holds the information needed to direct cellular processes?

• phenylalanine

• adenosine triphosphate

• chlorophyll

• deoxyribonucleic acid

Tags

NGSS.HS-LS1-1

The information in DNA is written according to the genetic code and carried by the -

• sequence of nitrogen bases/nucleotides

• direction of the phosphate groups

• hydrogen bonds between nitrogen bases

• enzymes which unwind the double helix

Tags

NGSS.HS-LS1-1

What do we call the shape a DNA molecule takes?

• double-stranded

• double helix

• sugar-phosphate backbone

• pentagon

The genetic code seems to suggest that all organisms are related. This conclusion is based on the fact that –

• all living things have unique coding systems

• each species has some form of a code

• every living thing uses the same code

• living things pass DNA to offspring

Tags

NGSS.HS-LS4-1

Which of the following is the correct pairing of nitrogen bases?

• A-T, G-C

• A-G, T-C

• A-C, G-T

• A-A, T-T

What are the three components of a nucleotide?

• phosphate group, sugar, nitrogen base

• phospate group, water, nitrogen base

• glycerol, sugar, nitrogen base

• adenine, thymine, cytosine

True or False: The genetic code is different for every organism.

• True

• False

What bonds the nitrogen bases in the center of the DNA strand?

• Covalent Bonds
• Ionic Bonds
• Hydrogen Bonds
• Metallic Bonds

In a sample of DNA, 20 percent is Adenine. What are the percentages of the other bases?

• Thymine - 30 percent, Cytosine 25 percent, Guanine 25 percent
• Cytosine - 20 percent, Thymine - 30 percent, Guanine 25 percent
• Thymine - 20 percent, Cytosine 30 percent, Guanine 30 percent
• Thymine - 30 percent, Cytosine 30 percent, Guanine 20 percent

Nucleotides are made up of a sugar, phosphate, and..?

• nitrogenous base
• nucleic acid
• cholesterol
• fatty acid