Q: When hydrochloric acid ($\mathrm{HCl}$) reacts with sodium hydroxide ($\mathrm{NaOH}$), what are the products?

$\mathrm{H_2O}$ \text{ and } \mathrm{NaCl}$

Question 1

Which of the following best describes the role of the MSDS (Material Safety Data Sheet) in a biology laboratory?

Accepted Answer

It lists safety rules, hazards, and first aid information for chemicals used in the lab.

Question 2

A student wants to test the hypothesis that increasing light intensity increases the rate of photosynthesis in plants. Which step of the scientific method is the student performing when they measure oxygen production under different light conditions?

Accepted Answer

Collecting data through experimentation

Question 3

Which of the following is an example of deductive reasoning in biology?

Accepted Answer

Observing that all cells have membranes and concluding that a newly discovered organism must have a cell membrane.

Question 4

A solution has a density of $2.5 \ \mathrm{g/cm^3}$ and a volume of $4 \ \mathrm{cm^3}$. What is its mass?

Accepted Answer

$10 \ \mathrm{g}$

Question 5

Which of the following is the correct way to convert $0.00056$ to scientific notation?

Accepted Answer

$5.6 	imes 10^{-4}$

Question 6

Which type of microscope would be most appropriate for viewing the surface details of a virus particle?

Accepted Answer

Scanning electron microscope

Question 7

As you increase the magnification on a light microscope, what typically happens to the field of view and the amount of light?

Accepted Answer

Field of view decreases, amount of light decreases

Question 8

Which cellular structure is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Cell membrane

Question 9

A student observes onion cells and cheek cells under a microscope. Which of the following is a key difference between these two cell types?

Accepted Answer

Onion cells have a cell wall, cheek cells do not.

Question 10

Using the periodic table, which of the following correctly gives the number of protons, neutrons, and electrons in a neutral atom of carbon-14 ($^{14}C$)?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 11

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

Dissolving sugar in water

Question 12

When hydrochloric acid ($\mathrm{HCl}$) reacts with sodium hydroxide ($\mathrm{NaOH}$), what are the products?

Accepted Answer

$\mathrm{H_2O}$ 	ext{ and } \mathrm{NaCl}$

Question 13

Which of the following statements about organic molecules is correct?

Accepted Answer

Polymers are made up of repeating monomers.

Question 14

A student tests a solution for protein using Biuret reagent. The solution turns purple. What does this indicate?

Accepted Answer

Protein is present in the solution.

Question 15

Which reagent is used to test for the presence of simple sugars, and what color change indicates a positive result?

Accepted Answer

Benedict's reagent; green, yellow, or orange after heating

Question 16

Which of the following best describes diffusion?

Accepted Answer

Movement of molecules from an area of high concentration to an area of low concentration

Question 17

A red blood cell is placed in a hypotonic solution. What will happen to the cell?

Accepted Answer

It will swell and may burst due to water entering the cell.

Question 18

Which of the following best defines osmosis?

Accepted Answer

Movement of water across a semipermeable membrane from low solute concentration to high solute concentration

Question 19

Which of the following is a difference between isotonic, hypotonic, and hypertonic solutions?

Accepted Answer

Isotonic solutions have equal solute concentration inside and outside the cell.

Question 20

A student mixes oil and water in a test tube. After shaking, the oil forms a separate layer on top of the water. What does this demonstrate?

Accepted Answer

Lipids are nonpolar and do not mix with polar substances like water.

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