Biochem Lecture 2

This is Biochemistry Lecture 2, which continues the discussion of organic compounds, specifically Lipids and Nucleic Acids.

Lipids and Nucleic Acids Quiz

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This is the 5-question quiz covering the key concepts from Biochem Lecture 2 (Honors Lecture 3).

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Question 1

What is (are) the monomer(s) of a lipid?

A	Monosaccharide Hint: This is actually the monomer of a carbohydrate; not a lipid.
B	Triglyceride Hint: This is actually the polymer of a lipid; not the monomer
C	Glycerol and 3 Fatty Acids
D	Polysaccharide Hint: This is actually the polymer of a carbohydrate; not the monomer of a lipid.

Question 1 Explanation:

Right! Lipids don't follow the traditional brick-to-house analogy. Instead the polymer (a Triglyceride) is made of a Glycerol backbone and 2 fatty acid tails (the monomers).

Question 2

Which of the following are liquid at room temperature?

A	Saturated fats Hint: Saturated fats are actually solid at room temperature.
B	Unsaturated fats
C	Animal fats Hint: Animal fats are saturated fats, so they're solid at room temperature.
D	Butter Hint: Butters are saturated fats, so they're solid at room temperature.

Question 2 Explanation:

Yeah! Because unsaturated fats have double bonds that bend their fatty acid tails, they don't clump together as tightly and are therefore liquid at room temperature!

Question 3

Which of the following is not a function of lipids?

A	They are the body's immediate energy source.
B	They are a secondary source of energy. Hint: This is actually a function of lipids. They are not the most efficient source of energy, but they will be used if the body's low on carbohydrates.
C	They make up the major components of the cell membrane. Hint: This is a very important function of lipids. If you removed lipids completely from your diet, your new cells could not develop a cell membrane properly.
D	They are used for long-term energy storage Hint: This is a major function. Because they're not the most efficient source of energy, they are often stored for use later.

Question 3 Explanation:

Great job! I hope you remember that carbohydrates are the body's immediate source of energy. Lipids are only used in the absence of carbohydrates, for the most part.

Question 4

Which of the following is not part of a nucleotide?

A	Phopshate Hint: These are very important parts of the outside of a nucleotide.
B	Carbohydrate Hint: This is tricky. Nucleotides do have a sugar, which you'll remember, is a carbohydrate.
C	Lipid
D	Nitrogen Base Hint: Nitrogen bases are actually the parts of a nucleotide that give all of the information for the cell.

Question 4 Explanation:

Nice! A nucleotide is made of a phosphate, a sugar, and a nitrogen base. There is no room for lipids within nucleic acids.

Question 5

What are the four bases found in DNA?

A	A, T, C, and G
B	A, U, C, and G Hint: These are actually the bases in RNA; something we'll talk more about later.
C	A, T, & T Hint: This is actually a company name. Try again.
D	P, B, & J Hint: This is actually a favorite snack of mine. Try again.

Question 5 Explanation:

Excellent! The four bases in DNA are Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).

There are 5 questions to complete.

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