Chapter 11 Test 2025

Frederic Griffith discovered transformation in his experiments on mice

and Pneumococcus bacteria. He injected the mice with combinations of

harmless,

R-strain bacteria and disease-causing S-strain bacteria. Which combination of

bacteria killed the mice and showed that transformation occurred?

• heat-killed R-strain and live S-strain

• heat-killed S-strain and live R-strain

• heat-killed bacteria of both strains

• live bacteria of both strains

Type question To learn more about Griffith’s experiment, scientists extracted a mixture of

various molecules from the heat-killed bacteria. They found that (a)   no longer occurred when they treated the mixture

with enzymes that destroyed ​ (b)   .​

This experiment supports the hypothesis that ​ (c)  

is the genetic material.

• transformation
• photosynthesis
• cellular respiration
• fermentation
• DNA
• proteins
• lipids
• RNA
• carbohydrate

Tags

NGSS.HS-LS1-1

Which statements describe a bacteriophage? Select all that apply.

• It is a type of virus that infects bacteria.

• It is a type of bacteria that infects viruses.

• It is a virus consisting of a protein coat and a DNA core.

• It is a bacterial strain consisting of protein and a DNA core.

The diagram illustrates the bacteriophages used in the Hershey-Chase

experiment. What was the purpose of marking the bacteriophages with phosphorus-32 and

sulfur-35?

• to track the movements of DNA and sugars

• to track the movements of DNA and proteins

• to remove DNA and sugars from the bacteriophages

• to combine DNA and proteins into a single molecule

What are three tasks that DNA must be able to perform in all organisms?

Select three answer choices.

• It must store genetic information.

• It must discard foreign genes.

• It must instruct cells to produce needed molecules.

• It must copy itself.

Tags

NGSS.HS-LS3-2

When does transformation occur?

• when an organism receives foreign RNA that is transformed into DNA

• when DNA is transformed into RNA

• when bacteria are killed with heat

• when a cell receives foreign DNA that is expressed as a new characteristic

A nucleotide of DNA may contain adenine, guanine, cytosine, or thymine.

What is each of these components?

• 5 carbon sugar

• nitrogenous base

• phosphate group

• nucleic acid

The image shows a nucleotide, a building block of the DNA molecule. From left to right, what are the names of the components?

• 5-carbon sugar, nitrogenous base, phosphate group

• nucleic acid, 5-carbon sugar, amino group

• 5-carbon sugar, nitrogenous base, carboxyl group

• nitrogenous base, 5-carbon sugar, phosphate group

Tags

NGSS.HS-LS1-1

DNA is made up of (a)   joined by covalent bonds between the (b)   of one monomer and the (c)   of the next monomer.

• nucleotides
• nitrogenous bases
• deoxyribose
• adenine
• guanine
• thymine
• phosphate group

Analyze the data about nitrogenous base content of DNA from various

species. Which three statements are supported by the data?

• In any one species, the amount of adenine closely approximates that of

  thymine.

• In any one species, the amount of guanine closely approximates that of

  cytosine.

• The amount of A, T, G, and C in DNA is constant among species.

• The amount of A, T, G, and C in DNA varies among species.