Unit 05: DNA, Cell Cycle, and Mitosis

All of the following make up a DNA nucleotide EXCEPT -

• Nitrogen Base

• Phosphorus Group

• Hydrogen Bonds

• Deoxyribose Sugar

Answer explanation

The hydrogen bond is not part of the nucleotide but DO hold two nucleotides together at the nitrogenous base.

What scientist discovered the DNA double helix (twisted ladder) shape of DNA?

• Franklin

• Watson

• Crick

Answer explanation

Rosalind Franklin took an x-ray photo that led to the discovery of the DNA double helix. She did not receive credit for it until she passed away.

Carbon, Hydrogen, and Oxygen are present in ALL biomolecules. What elements are only present in nucleic acids, like DNA?

• Nitrogen and Helium

• Phosphorus and Sulfur

• Nitrogen and Potassium

• Nitrogen and Phosphorus

Answer explanation

The 5 elements in DNA are: Carbon, Hydrogen, Oxygen, Nitrogen, and Phosphorus

In DNA, adenine (A) always pairs with what base?

• (A) adenine

• (C) cytosine

• (G) guanine

• (T) thymine

Answer explanation

(A)pples grow in (T)rees

In DNA, cytosine (C) always pairs with what base?

• (A) adenine

• (C) cytosine

• (G) guanine

• (T) thymine

Answer explanation

(C)ars go in (G)grages

or

(C)ouple (G)oals

What is the complementary strand given this DNA segment:

ATGGTCTCAG

(a)  

Answer explanation

A and T pair together and C and G pair together so:

ATGGTCTCAG --> TACCAGAGTC

What part of DNA codes for specific traits in all organisms?

• The number of bases present

• The sequence/order of the nitrogen bases

• The order of the sugar-phosphate backbone

• The number of nucleotides present.

Answer explanation

The only thing that changes between your DNA and mine is the order/sequence in which our bases appear. Think of a phone number: each phone number has 10 digits, but the order I put the numbers in will change who I end up calling.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

What 2 things would be attached to a guanine (G) base?

• Phosphate and Deoxyribose Sugar

• Deoxyribose Sugar and thymine (T)

• Phosphate and cytosine (C)

• Deoxyribose Sugar and cytosine (C)

Answer explanation

Remember that nitrogen bases are attached to the deoxyribose sugar in DNA. The other thing a nitrogen base is attached to is its complementary base pair. In this case, G is attached to C because they always pair together.

What part of the DNA strand is in the red circle?

• Backbone

• Hydrogen Bond

• Base Pair

Tags

NGSS.MS-LS3-2

What part of the DNA strand is in the red rectangle?

• Backbone

• Hydrogen Bond

• Base Pair