Terrie is making a model of DNA. Which of these shapes illustrates how her model should look?

• 
• 
• 
• 

Dylan is listing the molecules that make up DNA. Which of these substances should he place under the heading NUCLEOTIDE BASE in DNA?

• adenine

• phosphate

• sugar

• uracil

The diagram below shows an original sequence of DNA and then a mutated sequence of DNA. Which type of mutation took place?

• deletion

• insertion

• substitution

• translation

Alice is studying biological molecules. She has isolated a molecule and identified the nucleotide bases adenine, cytosine, guanine, and thymine. Which molecule did Alice isolate?

• DNA

• mRNA

• rRNA

• tRNA

Rachel is analyzing a DNA sample to identify base pairs. Her results show that 40% of the sample is adenine. Which other base must also make up 40% of the sample?

• Cytosine makes up 40% of the sample

• Guanine makes up 40% of the sample.

• Thymine makes up 40% of the sample.

• Uracil makes up 40% of the sample.

The following sequence of letters represents the order of bases in a single strand of DNA.

C-T-T-A-G-G-C-T-T-A-C-C-A

Which of these sequences would be the complementary strand that forms during replication?

• G-A-A-T-C-C-G-A-A-T-G-G-T

• C-T-T-A-G-G-C-T-T-A-C-C-A

• T-C-C-G-A-A-T-C-C-G-T-T-G

• A-G-G-C-T-T-A-G-G-C-A-A-C

Which claim correctly defines DNA?

• It is a type of molecule that performs the main functions of cells.

• It is a type of molecule composed mostly of amino acids.

• It is a type of molecule that speeds up the rate of a chemical reaction.

• It is a type of molecule that determines the traits that an individual inherits.

Which of the following properties of DNA was discovered by James Watson and Francis Crick?

• DNA is composed of four bases.

• DNA looks like a long, twisted ladder.

• DNA nucleotides always combine in the same pairs.

• DNA has a doughnut shape when viewed using x-ray diffraction.

The images below represent the four bases present in DNA. Which of the following correctly identifies a base pair?

• A-T

• A-G

• G-T

• C-T

Which of these effects could not be directly caused by mutations in human DNA?

• cancer

• an injury

• a genetic disorder

• an inherited disorder