Genetic Continuity

A cell is represented in the diagram below. Which statement about the cell is correct?

• Structure A synthesizes and secretes cellular products.

• Structure B contains chromosomes involved in transmitting genetic information.

• Structure C utilizes DNA in the process of photosynthesis.

• Structure D is the site of protein synthesis.

Which materials are composed of DNA?

• Proteins

• Genes

• Nerve secretions

• Fluid in vacuoles

In an animal cell, DNA is found in the greatest concentration in the

• Vacuole

• Ribosome

• Nucleus

• Cytoplasm

Cystic fibrosis is a genetic disease. Examine the illustration below. The mother's cells most likely contained

• A disease-causing virus

• One normal gene and one abnormal gene

• Two normal genes

• An abnormal number of chromosomes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Bacteria in culture A produce slime capsules around their cell walls. A biologist removed the DNA from some of the bacteria in culture A. He then injected it into bacteria in culture B, which normally do not produce slime capsules. After the injection, bacteria with slime capsules began to appear in culture B. What conclusion could best be drawn from this investigation?

• The bacteria in culture A are mutations.

• Bacteria reproduce faster when they have slime capsules.

• The slime capsules of bacteria in culture B contain DNA.

• DNA is most likely involved in the production of slime capsules.

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NGSS.HS-LS1-1

NGSS.HS-LS3-2

The letters in the diagram below represent genes on a particular chromosome. Gene B contains the code for an enzyme that cannot be synthesized unless gene A is also active. Which statement best explains why this can occur?

• A hereditary trait can be determined by more than one gene.

• Genes are made up of double-stranded segments of DNA.

• All the genes on a chromosome act to produce a single trait.

• The first gene on each chromosome controls all the other genes on the chromosomes.

Tags

NGSS.HS-LS3-1

Which cell structure contains all of the others?

• Nucleus

• Gene

• DNA

• Chromosome