TEKS 6A-DNA

What property of DNA does bacterial transformation illustrate?

• Bacterial DNA cannot move into other bacteria and function.
• Bacterial DNA can move into another bacteria and function.
• Bacterial DNA uses four nucleotides bases that work in pairs.
• Bacterial DNA is found in a circular chromosome.

Which part of the bacteriophage in the drawing contains genetic material?

• A
• B
• C
• C

What happens when a piece of DNA is missing?

• Genetic information is stored.
• Genetic information is copied.
• Genetic information is lost.
• Genetic information is transmitted.

In which cells is the accurate transmission of information most important?

• Nerve cells
• Skin cells
• Sex cells
• Bone cells

The drawing shows the structure of what molecule?

• A DNA molecule
• A lipid molecule
• A carbohydrate molecule
• A protein molecule

The table shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s rule, the percentages of guanine bases in chicken DNA should be approximately what?

• 28.8%
• 19.9%
• 21.5%
• 13.4%

Based on Chargaff’s rule, the percentage of cytosine in the DNA of the bacterium, S. lutea in the table, should be approximately what?

• 26.6%.
• 73.2%.
• 36.6%.
• 29.4%.

Which of the following statements correctly describes Chargaff’s contribution to the study of DNA?

• Chargaff hypothesized that DNA was a double helix.
• Chargaff’s experiments conclusively proved that DNA was made of nucleotides.
• Chargaff showed that adenine and thymine were found in equal percentages in DNA.
• Chargaff’s work proved that DNA could be made using radioactive nucleotides.

What enzyme works to add DNA to ends of chromosomes in rapidly dividing cells such as those found in an embryo, to prevent genes from being lost during replication?

• DNA polymerase
• histones
• telomeres
• chromatin

In the drawing, what nucleotide is going to be added at point 1, opposite from thymine?

• adenine
• thymine
• cytosine
• guanine