3A and 3B CSA Review

Write the complimentary strand to DNA for the strand given below
T A A C C G T T A C G A

Answer explanation

A always pairs with t, and G always pairs with C

What is the name of the molecule that brings the complementary base pair (nucleotide) to build the new strand of DNA during DNA replication?

• DNA Polymerase

• RNA Polymerase

• DNA Helicase

• RNA Helicase

Answer explanation

Remember Poly means "many" so the polymerase brings over "many nucleotides"

What is the name of the molecule that unzips the DNA Helix ?

• DNA Polymerase

• RNA Polyermase

• DNA Helicase

• RNA Helicase

Answer explanation

Remeber DNA is in the shape of a Helix, so there for the DNA Helicase is responsible for unwinding and unzipping the Helix

In which organelle does DNA replication take place?

• Lysosome

• Ribosome

• Nucleus

• Vacuole

Answer explanation

DNA is ONLY every found in the nucleus of the eukaryotic cell, so there for replication has to take place there since that is where DNA is.

Why is the process of DNA replication considered to be semiconservative?

• Because there is enough DNA for each new cell during cell division

• Because each new strand DNA is paired with an old original strand of DNA

• Because DNA replication is a conservative process

• Because two strands that are created from DNA replication do not have an identical genetic code

Answer explanation

Semiconservative means that each strnad of DNA has an original strand as well as a new strand.

Which of the following statements is true about DNA and RNA, check all that apply

• DNA is double stranded
  RNA is single Stranded

• RNA has Ribose as it's sugar and DNA has Deoxyribose as it's sugar

• They are both made up of nucleotides

• RNA use Thymine and DNA uses Uracil

Answer explanation

When DNA is copied into mRNA the process is called

• Replication

• Transcription

• Translation

• Alternative splicing

Answer explanation

DNA is "transcribed" or copied into mRNA

What happens during the process of translation

• mRNA is copied into DNA

• mRNA is converted into a strand of amino acids

• amino acids are converted to mRNA

• DNA is copied to tRNA

Answer explanation

mRNA is a different langugage that needs to be "translated" into an amino acid sequence

Transcription occurs where in the cell?

• Ribosome

• Nucleus

• Mitochondria

• Lysosome

Answer explanation

Since transcription is copying DNA to mRNA it has to happen in the nucleus because that is the only place where DNA is found in a Eukarytoic cell.

Translation occurs where in the cell?

• Ribosome

• Nucleus

• Mitochondria

• Lysosome

Answer explanation

Ribosomes make proteins, and an amino acid sequence builds a protein