Unit 4 Concept 1 & 2

The two strands of a DNA molecule are held together by ________ bonds between their base pairs.

• covalent
• hydrogen
• ionic
• peptide

Which of the following is not a base found in DNA?

• adenine
• thymine
• cytosine
• uracil

What part of a nucleotide accounts for the genetic variation between individuals?

• phosphate
• nitrogenous base
• deoxyribose
• sugar

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2

If a segment of double-stranded DNA has 40 percent A, how much of it is C?

• 40
• 10
• 15
• 20

If one strand of DNA has the sequence TTACCG, the sequence of the other strand of the same molecule will be

• AATGGC
• TTACCG
• AACGGC
• AATGGG

Once replication in a DNA molecule is complete, each new DNA molecule contains 

• two new strands.
• 3 exact copies of strands.
• one new strand and one old.
• two old strands.

The polymerase chain reaction (PCR) is used to

• insert DNA from one organism into a new host.
• screen for a particular gene.
• produce many copies of a selected DNA sequence.

Which of the following will NOT generally cause mutations?

• radiation
• DNA replication
• chemicals
• viruses

Tags

NGSS.HS-LS3-2

Which enzyme copies DNA?

• DNA polymerase
• DNA helicase
• RNA polymerase
• RNA helicase

What are the functions of genes?

• instructions for producing proteins
• instructions for producing DNA
• instructions for producing lipids
• they have no function

Tags

NGSS.HS-LS1-1