The egg whites from four "large" eggs occupy a volume of $112 \mathrm{~mL}$. The mass of the egg whites from these four eggs is $1.20 \times 10^2 \mathrm{~g}$. What is the average density of an egg white from one "large" egg?

Any substance that is acted upon by an enzyme is called a?

Draw the structure of the dipeptide formed by two molecules of the amino acid alanine.

You are studying enzyme "X" whose active site consists of 5 amino acids; 2 acidic amino acids and 3 amino acids with R-groups containing only non-polar covalent bonds. What chemical properties would you expect the substrate for enzyme "X" to have?

What do you call the repeating units in both DNA and RNA?

A. nucleic acids

B. nucleotides

C. hydrogen bonds

D. amino acids

Draw one possible dipeptide that is formed betwcen alanine and leucine, as the zwitterion!

Each protein monomer is made up of four parts bound to a central carbon. List the 4 parts by name.

Given the formulas of the common amino acids in Fig. 21.2, sketch the structures of the six different tripeptides possible containing phenylalanine, alanine, and glycine. Circle the peptide bonds in your structures. Label the terminal amino and carboxyl groups clearly.

Amino acid analysis of a certain tetrapeptide gave alanine, glycine, phenylalanine, and valine in equimolar amounts. What amino acid sequences are possible for this tetrapeptide?

Explain the biuret reagent in protein tests.

The cup is a measure of volume widely used in cookbooks. One cup is equivalent to $225 \mathrm{~mL}$. What is the density of clover honey (in grams per milliliter) if three quarters of a cup has a mass of $252 \mathrm{~g}$?

In the old pharmaceutical system of measurements, masses were expressed in grains. There are $5.760 \times 10^3$ grains in $1 \mathrm{lb}$. An old bottle of aspirin lists $5.000$ grains of active ingredient per tablet. How many milligrams of active ingredient are there in the same tablet?

In Europe, nutritional information is given in kilojoules $(\mathrm{kJ})$ instead of nutritional calories (1 nutritional calorie $=$ $1 \mathrm{kcal})$. A packet of soup has the following nutritional information:

$$250 \mathrm{~mL} \text { of soup }=235 \mathrm{~kJ}$$

How would that same packet be labeled in the United States if the information has to be given in nutritional calories per cup? (There are $4.18$ joules in one calorie and 2 cups to a pint.)

The area of the 48 contiguous states is $3.02 \times 10^6 \mathrm{mi}^2$. Assume that these states are completely flat (no mountains and no valleys). What volume, in liters, would cover these states with a rainfall of two inches?