ERS 4

Which of the following is true about viruses?

• They are alive

• Any 1 virus is capable of infecting all species

• They are unable to reproduce outside of a host cells

• They are also known as prions

If a DNA sample has 22% thymine (T), how much adenine (A) is present in the sample?

• 44%

• 15%
• 30%
• 22%

If an RNA sample has 15% uracil (U), how much guanine (G) is present in the sample?

• 35%

• 15%

• 30%

• 10%

What does the semiconservative model refer to?

• The semiconservative model involves the complete replacement of both DNA strands
• Each new DNA molecule consists of one original strand and one newly synthesized strand.
• The semiconservative model refers to the replication of RNA instead of DNA
• Each new DNA molecule consists of two original strands

Which best explains the structure of DNA?

• DNA is a single-stranded linear structure
• DNA is a double helix structure made up of nucleotides that contain a sugar-phosphate backbone and nitrogenous bases.
• DNA is a double helix structure that has nucleotides and a sugar called deoxyribose

• DNA is a circular structure with no specific pattern

What does antiparallel structure of DNA mean?

• The bases have specific other bases that they can bind to

• Opposite direction of the two DNA strands
• All bases can pair with any other bases

• DNA strands are running parallel to each other

Which of the following lists what T pairs with in RNA

• A

• Nothing, T does not exist in RNA

• U

• G

What is the function of helicase?

• Unwinds the double-stranded DNA helix
• Adds nucleotides to the growing DNA strand
• Proofreads the newly synthesized DNA strand
• Joins Okazaki fragments

Polymerase III

• Polymerase III is only found in viruses.
• Polymerase III synthesizes RNA

• Polymerase III is involved in protein synthesis.
• Polymerase III synthesizes DNA

What is important to know about the way Polymerase III synthesizes DNA?

Answer explanation

It can only synthesize 5' to 3'