2.7 IB DNA Replication

Front

Which is true about the relationship between enzymes and DNA?

Back

The shape of a protein is due to the base sequence in the DNA that coded for it

Answer explanation

Remember, DNA codes directly for proteins.

Front

Which units (monomers) are repeatedly joined to form a strand of DNA?

Back

nucleotides

Answer explanation

Front

In a molecule of double-stranded DNA, the amount of adenine present is always equal to the amount of...

Back

thymine

Answer explanation

This is all thanks to our main man, Mr. Chargaff!

Front

Replicate the following strand of DNA: AAT CAT GGA

Back

TTA GTA CCT

Answer explanation

You need to know the which base pairs with which, there are no two ways around it.

Front

Order of replication: 3, 2, 1, 4, 2, 1, 4, 3, 2, 3, 1, 4, 3, 4, 1, 2

Back

3, 4, 1, 2

Answer explanation

#1 break the h-bonds between the bases.

#2 after adding a primer, build each new strand by using the template strand and following complimentary base pairing.

#3 voila! We end up with two identical DNA strands which are semiconservative.

Front

The enzyme that attaches the complimentary base pairs to the original strand of DNA is called...

Back

DNA polymerase III

Answer explanation

The type of DNA polymerase is DNA polymerase III, but don't stress too much about it.

Front

The enzyme that breaks the hydrogen bonds between the bases to prepare for replication.

Back

helicase

Answer explanation

Remember, helicase breaks the helix.

Front

Nitrogenous bases are joined by which type of bond? Options: polar bonds, ionic bonds, covalent bonds, hydrogen bonds

Back

hydrogen bonds

Answer explanation

Hydrogen bonds are temporary which allows us to access the bases with relative ease.

Front

If a DNA molecule is 18% Guanine, what are the percentages of cytosine, adenine, and thymine?

Back

18% cytosine, 32% adenine, 32% thymine

Answer explanation

18% G = 18% C (36% total)

32% A = 32% T (64%total)

Front

DNA Replication is described as...

Back

Semi-Conservative

Answer explanation

It is semi-conservative because part of the original DNA has been conserved in the new strand.