Nitrogenous bases are joined by which type of bond?

• polar bonds

• ionic bonds

• covalent bonds

• hydrogen bonds

Answer explanation

Nitrogenous bases are joined by hydrogen bonds, which are weak attractions between a hydrogen atom and an electronegative atom like nitrogen or oxygen.

Tags

NGSS.HS-LS1-1

Which 2 molecules form the sides (backbone) of the DNA ladder?

• deoxyribose sugar and adenine

• deoxyribose sugar and a hydrogen bond

• deoxyribose sugar and the nucleus

• deoxyribose sugar and phosphate

Answer explanation

The correct molecules forming the sides of the DNA ladder are deoxyribose sugar and phosphate.

Tags

NGSS.HS-LS1-1

Why is DNA important?

• it is very small and very complicated

• it's in everything

• it serves as the blueprint for traits of all living things

• because we eat it every day for energy

Answer explanation

DNA is important because it serves as the blueprint for traits of all living things.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

DNA replication results in two DNA molecules,

• each one with two original strands

• each one with two new strands

• each one with one new strand and one original strand

• one with two new strands and the other with two original strands

Answer explanation

DNA replication results in two DNA molecules, each with one new strand and one original strand, forming a semi-conservative process.

What is the correct complimentary strand for the following DNA? [ATCGAG]

• TACGAG

• ATCGAG

• TAGCTG

• TAGCTC

Answer explanation

The correct complimentary strand for the given DNA sequence [ATCGAG] is TAGCTC, where A pairs with T, T pairs with A, C pairs with G, and G pairs with C.

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

• G1

• S

• G2

• M

Answer explanation

DNA replication takes place in the S phase of the cell cycle.

Which enzyme is primarily responsible for copying DNA?

• Topoisomerase

• DNA Polymerase

• Ligase

• Primase

Answer explanation

DNA Polymerase is primarily responsible for copying DNA by synthesizing a new strand complementary to the template strand during DNA replication.

Tags

HS-LS3-1

Which of the following monomers are repeatedly joined together to form a strand of DNA?

• amino acids

• nucleotides

• fatty acids

• polysaccharides

Answer explanation

Nucleotides are repeatedly joined together to form a strand of DNA.

Tags

NGSS.HS-LS1-1

In eukaryotes, DNA is usually found in the​ (a)   , while in prokaryotes, DNA is found in the ​ (b)   .

• nucleus

• cytoplasm

Answer explanation

In eukaryotes, DNA is found in the nucleus, while in prokaryotes, DNA is found in the cytoplasm. This is a key difference between the two types of cells.

The picture below shows the steps of DNA replication beginning with step one and ending with step three.

​Because you are reusing the old, or parent, DNA strand DNA replication is said to be

• Semi- Conservative

• Semi-discontinuous

• Continuous

• Fully-Conserveative

Answer explanation

DNA replication is considered semi-conservative because one strand of the parent DNA molecule is conserved in each new DNA molecule.