DNA Review

DNA is shaped like

• A square

• Twisted Ladder

• Half circle

• Helix line

What is a nucleotide?

• Phosphate, sugar, nitrogen base

• Phosphate, sugar, nucleus

• Sugar, adenine, thymine

• DNA, phosphate, nitrogen base

What is the purpose of DNA?

• Makes a nucleus to create a trait

• Makes mitochondria to make a protein

• Makes proteins to create a nucleus

• Makes proteins to create traits

How many chromosome PAIRS does a human have?

• 21,000

• 46

• 23

• 21

How many genes do humans have?

• 21

• 23

• 28,000

• 21,000

What is the first step in DNA replicating?

• 1. Begin with original double strand of DNA

• 1. Begin with original RNA

• 1. Begin with a single strand of RNA

• 1. Begin with a single strand of DNA

What is the 2nd step of DNA replicating?

• 2. DNA copies

• 2. RNA unzips with an enzyme

• 2. DNA unzips with an enzyme

• 2. RNA is copied

What is the 3rd part of DNA replicating?

• 3. Guanine is added to thymine

• 3. Adenine is added to cytosine

• 3. New DNA double strands are added

• 3. New nucleotides are added

What is the final step of DNA replication?

• 2 new exact copies of DNA

• 3 new exact copies of DNA

• 2 different copies of DNA

What is the difference between RNA and DNA?

• RNA is single stranded and DNA is double stranded

• RNA is double stranded and DNA is single stranded