Question 1

Which of the following is the correct conversion for 5 mg/mL into other units?

Accepted Answer

5 μg/μL

Question 2

A solution contains 20 g/L of a solute with a molecular weight of 200 g/mol. What is its molar concentration?

Accepted Answer

$$0.1\ M$$

Question 3

Which metric prefix corresponds to $$10^{-9}$$?

Accepted Answer

nano (n)

Question 4

If the average molecular weight of proteins is 50,000 g/mol and their concentration is 200 g/L, what is the molar concentration?

Accepted Answer

$$4\ mM$$

Question 5

What is the formula for calculating pH from hydrogen ion concentration?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[H^+]$$

Question 6

A cube has a side length of 10 cm. What is its volume?

Accepted Answer

$$1000\ \mathrm{cm}^3$$

Question 7

Which of the following best describes the relationship between area and volume as an object increases in size?

Accepted Answer

Volume increases faster than area

Question 8

Given $$[H^+] = 10$$^{-3}$$\ M$$, what is the pH of the solution?

Accepted Answer

pH = 3

Question 9

Which of the following is the correct value for 1% (w/v) NaCl solution in terms of grams per 100 mL?

Accepted Answer

1 g/100 mL

Question 10

If a ligand binding curve is plotted on a log scale, what is the main advantage compared to a linear scale?

Accepted Answer

It expands the low concentration range, making it easier to see binding at low ligand concentrations

Question 11

What is the average distance between molecules at a concentration of 1 mM, given $$d_{av} (nm) = \frac{1.2}{\sqrt[3]{C}}$$ where $$C is in M$$?

Accepted Answer

120 nm

Question 12

Which of the following best explains why the effect of a drug on blood pressure levels off at higher doses?

Accepted Answer

The receptors become saturated, resembling a ligand binding curve

Question 13

If the LD$$_{50} of a $$scorpion venom is 1.075 μg/g, what does this value represent?

Accepted Answer

The dose at which 50% of the mice die

Question 14

Which of the following is the correct order of magnitude for the size of a typical bacterium?

Accepted Answer

$$1-10\ \mu m$$

Question 15

Which of the following statements about affinity and specificity is correct?

Accepted Answer

A molecule can have high affinity for multiple targets but only high specificity for one

Question 16

If a saline solution contains 0.9 g NaCl per 100 mL, what is its molarity? (NaCl MW = 58.5 g/mol)

Accepted Answer

$$0.154\ M$$

Question 17

Which of the following best describes the effect of increasing body size on the area-to-volume ratio?

Accepted Answer

The area-to-volume ratio decreases

Question 18

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.02 	imes 10$$^{23}$$

Question 19

Which of the following is the correct relationship for the rate of many metabolic processes with respect to the size (d) of an organism?

Accepted Answer

$$\sim d^3$

Question 20

Which of the following is the best reason for using scientific notation and metric prefixes in scientific communication?

Accepted Answer

To avoid writing long strings of zeros and improve clarity

Units, Numbers, and Energy in Biological Systems: Foundations for Microbiology

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