$$1\ \text{kg} = 1000\ \text{g}$$

$$[H^+] = 1 \times 10$$^{-4}$$\ \text{M}$$

$$^{\circ}\text{F} = $$(^{\circ}$$\text{C} \times \frac{9}{5}) + 32$$

Question 1

Which type of organic molecule is depicted in the first image, and what is its primary biological function?

Accepted Answer

A triglyceride; it is used for long-term energy storage in animals.

Question 2

In the second image, what type of bond links the backbone of the molecules shown?

Accepted Answer

Peptide bonds

Question 3

Which of the following best describes the difference in light source placement between a compound microscope and a dissecting microscope?

Accepted Answer

Compound microscopes have the light source below the specimen, while dissecting microscopes have it above.

Question 4

Which of the following is a correct conversion between metric units?

Accepted Answer

$$1\ 	ext{kg} = 1000\ 	ext{g}$$

Question 5

A student measures a solution with a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$\ 	ext{M}$$

Question 6

Which test would you use to detect the presence of starch in a food sample, and what color indicates a positive result?

Accepted Answer

Iodine test; bluish-black color

Question 7

What is the main advantage of using a dissecting microscope over a compound microscope?

Accepted Answer

It allows viewing of larger, three-dimensional specimens at lower magnification.

Question 8

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A testable statement that can be supported or refuted, but not proven true.

Question 9

If a solution changes from pH 7 to pH 5, how many times more acidic has it become?

Accepted Answer

100 times more acidic

Question 10

Which of the following is a function of a buffer in a biological system?

Accepted Answer

It minimizes changes in pH when acids or bases are added.

Question 11

What is the correct formula to convert degrees Celsius ($$^{\circ}	ext{C}) to $$degrees Fahrenheit ($$^{\circ}	ext{F}$$)?

Accepted Answer

$$^{\circ}	ext{F} = $$(^{\circ}$$	ext{C} 	imes \frac{9}{5}) + 32$$

Question 12

Which of the following best describes the trend in cranial capacity during human evolution?

Accepted Answer

Cranial capacity generally increased over time in hominins.

Question 13

Which of the following is a correct statement about the pH scale?

Accepted Answer

It is logarithmic, with each unit representing a tenfold change in $$[H^+]$$ concentration.

Question 14

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms; unsaturated fatty acids have one or more double bonds.

Question 15

What is the purpose of using a positive control in a biochemical test?

Accepted Answer

To confirm that the test is working and can detect the substance of interest.

Question 16

Which of the following best describes the function of the 'Tare' button on an electronic balance?

Accepted Answer

It resets the balance to zero, subtracting the weight of the container.

Question 17

Which of the following is the correct formula for calculating pH?

Accepted Answer

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

Question 18

Which of the following best describes the backbone structure shown in the second image?

Accepted Answer

It is a polypeptide backbone formed by amino acids linked by peptide bonds.

Question 19

Which of the following is a correct statement about the working distance in compound and dissecting microscopes?

Accepted Answer

Compound microscopes have a small working distance, while dissecting microscopes have a large working distance.

Biology 1406 Lab Exam Review – Step-by-Step Study Guidance

Study Guide - Practice Questions