NGHS Biology

Label the nucleotide

a

b

c

Phosphate

Nitrogenous base

Sugar

Tags

NGSS.HS-LS1-1

Match the following enzymes to their roles in DNA replication.

• "Glue" the two strands together.

• Ligase

• Unzips (separates)the two DNA strands

• Helicase

• Pairs up complementary bases such as A-T

• DNA polymerase

Tags

IST-1

Which is the order of replication?

• 3, 2, 1, 4

• 2, 1, 4, 3

• 2, 3, 1, 4

• 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.

Tags

NGSS.HS-LS3-2

If a DNA molecule is 18% Guanine which of the following is correct?

• 18% cytosine, 32% adenine, 32% thymine

• 32% cytosine, 18% adenine, 32% thymine

• 18% cytosine, 64% adenine, 64% thymine

• 32% cytosine, 32% adenine, 18% thymine

Answer explanation

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

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

Label the image with the correct enzymes and the processes in the DNA replication.

a

c

e

Ligase- adds the complementary bases. 

DNA polymerase- add complementary bases

Helicase- "glue " the 2 strands of DNA

Helicase- unzips the 2 strands of DNA

DNA polymerase - unzips the DNA.

Ligase- glue the two strands together.

In what phase of the cell cycle does DNA replication take place?

• Gap 1 (G1)

• Synthesis (S)

• Gap 2 (G2)

• Mitosis (M)

What does it mean by semi-conservative in DNA replication?

• Each new double helix contains two old strands because it is DNA replication is conservative.

• Semi-conservative means no strands are conserved, and all these strands are dispersed.

• In DNA replication, semi-conservative means that each new double helix contains one old strand and one new strand.

• All strands in the new double helix are newly synthesized, and all two strands are new.

For each statement below, indicate if it is referring to DNA, RNA, or both

• DNA

• involves in the process of making protein.

• Both

• 
  Can only be found in the nucleus but not in the cytoplasm in the eukaryotic cells.

• RNA

• Are nucleic acid and made of nucleotide

Tags

NGSS.HS-LS1-1

Which of the diagram below demonstrate the semi-conservative model of DNA replication?

• 
• 
• 
• 

A scientist observes a base sequence of A G C T A G C  Which of the following would be the complimentary DNA strand?

• A G C T A G C

• T C G A T C G

• U C G A U C G

• G C U A G C U