DNA structure and replication

Which of the following is NOT part of a nucleotide

• sugar

• phosphate

• nitrogen base

• amino acid

Adenine pairs with

• Thymine

• Thyme

• Guanine

• Glutamine

The backbone of DNA is made of

• base pairs

• sugars and phosphates

• only sugars

• only phosphates

The two strands of DNA are held together with

• covalent bonds

• hydrogen bonds

• nothing

One function of DNA is to

• code for proteins

• code for lipids

• code for carbohydrates

Tags

NGSS.HS-LS1-1

The first step in DNA replication is

• to unwind and unzip the two strands

• to break the backbone in half so the sequence can be copies

• to attach new nucleotides

• to proof read the sequence

What does semiconservative replication mean?

• that the DNA is proof read at the end of the process

• that the newly made DNA has one strand from the original DNA and one new strand

• that the newly made DNA will send half of its strand to one cell and leave the old strand in the original cell

• that the original DNA strands come back together after replication is over

The DNA sequence is TTA CCG What is the complementary sequence?

• TTA CCG

• AAT GGC

• GGC AAT

What does the term antiparallel refer to?

• the two strands are connected upside down

• the the DNA is made of two strands

• DNA twists

• DNA copies itself from bottom up to the top of the strand

When DNA replicates what is separated?

• the backbone

• the base pairs

• the sequence of bases

• the sugar- phosphate bond