Understanding Nucleotides and DNA

Which of the following elements is NOT found in nucleotides?

• Sulfur

• Carbon

• Oxygen

• Nitrogen

What are the two types of nitrogenous rings found in nucleotides?

• Ribose and Deoxyribose

• Cytosine and Guanine

• Adenine and Thymine

• Purines and Pyrimidines

Which nucleotide is NOT part of DNA?

• Uracil

• Cytosine

• Adenine

• Thymine

What is the backbone of DNA composed of?

• Lipids

• Amino acids

• Sugar and phosphate

• Nitrogenous bases

How many hydrogen bonds are formed between guanine and cytosine?

• Three

• Two

• Four

• One

What is the shape of the DNA molecule?

• Linear strand

• Triple helix

• Double helix

• Single helix

Why is it easier to break the bonds between adenine and thymine compared to guanine and cytosine?

• Weaker ionic bonds

• Stronger covalent bonds

• More hydrogen bonds

• Fewer hydrogen bonds

Approximately how many nucleotides are present in each human cell?

• 3 billion

• 5 billion

• 1 million

• 10 million

What is the next step after DNA is transcribed?

• Translation into proteins

• Replication

• Transcription into RNA

• Degradation

Which cells in the human body do not contain DNA?

• Red blood cells

• Skin cells

• Muscle cells

• Nerve cells