Second Semester Final Exam

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil

Why is DNA important?

• it is very small and very complicated

• it's in everything

• it has the instructions for making proteins

• because we eat it every day for energy

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

Nitrogenous bases are joined in the middle by which type of bond?

• polar bonds

• ionic bonds

• covalent bonds

• hydrogen bonds

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base
• sugar, oxygen, nitrogen base
• sugar, phosphate, nitrogen base
• sugar, phosphate, protein

Cytosine always pairs with

• Adenine
• Thymine
• Uracil
• Guanine

Name this structure

• double helix
• nucelotide
• twisted ladder
• hydrogen bond

Which organelle is DNA usually found in?

• cell membrane
• vacuole
• ribosome
• nucleus

The phosphates and sugars are held together along the sides of DNA with:

• Hydrogen Bonds

• Covalent bonds

• Glycolsyl Bonds

• Proteins

What is the other half to the DNA strand below: ATGCCAT

• TACGGTA

• UACGGUA

• ATGGCAT

• ATGGCAT