Biochem Lecture 3
This is Biochemistry Lecture 3, which focuses on Lipids and Nucleic Acids.
Lipids and Nucleic Acids Quiz
This is the 5-question quiz covering the key concepts from Biochem Lecture 2 (Honors Lecture 3).
What is (are) the monomer(s) of a lipid?
This is actually the monomer of a carbohydrate; not a lipid.
This is actually the polymer of a lipid; not the monomer
Glycerol and 3 Fatty Acids
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).
Which of the following are liquid at room temperature?
Saturated fats are actually solid at room temperature.
Animal fats are saturated fats, so they're solid at room temperature.
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!
Which of the following is not a function of lipids?
They are the body's immediate energy source.
They are a secondary source of energy.
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.
They make up the major components of the cell membrane.
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.
They are used for long-term energy storage
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.
Which of the following is not part of a nucleotide?
These are very important parts of the outside of a nucleotide.
This is tricky. Nucleotides do have a sugar, which you'll remember, is a carbohydrate.
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.
What are the four bases found in DNA?
A, T, C, and G
A, U, C, and G
These are actually the bases in RNA; something we'll talk more about later.
A, T, & T
This is actually a company name. Try again.
P, B, & J
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).
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