Biology Unit 3 - 25.1-25.2

What is the structure of a DNA molecule?

• Double helix

• Single strand

• Triple helix

• Quadruple strand

Why is DNA replication considered semiconservative?

• Each new DNA molecule has two new strands

• Each new DNA molecule has one old and one new strand

• Each new DNA molecule has two old strands

• Each new DNA molecule is completely new

In which century did geneticists determine that DNA is the genetic material?

• Nineteenth century

• Mid-twentieth century

• Twenty-first century

• Eighteenth century

Tags

NGSS.HS-LS1-1

What does DNA stand for?

• Deoxyribonucleic acid

• Deoxyribose acid

• Deoxynucleic acid

• Deoxyribogenetic acid

What was one of the known qualities of genetic material prior to certain efforts?

• It could not store any information.

• It was unstable and could not be replicated.

• It was able to store information for development, structure, and metabolism.

• It was only useful for short-term processes.

Tags

NGSS.HS-LS1-1

Why was genetic material considered stable?

• It could not be replicated.

• It could be replicated with high accuracy and transmitted from generation to generation.

• It was easily altered by environmental factors.

• It was only stable in certain conditions.

Who began the research on the genetic role of DNA in 1931?

• James Watson

• Frederick Griffith

• Rosalind Franklin

• Francis Crick

What type of bacteria did Frederick Griffith work with in his research?

• Escherichia coli

• Bacillus subtilis

• Streptococcus pneumoniae

• Staphylococcus aureus

What characteristic did the S strain of Streptococcus pneumoniae have?

• It appeared rough and lacked a capsule.

• It appeared smooth because it had a capsule.

• It was resistant to antibiotics.

• It was non-pathogenic.

What was the appearance of the R strain of Streptococcus pneumoniae?

• Smooth with a capsule

• Rough and lacked a capsule

• Smooth and antibiotic-resistant

• Rough with a capsule