Question 1

Which of the following best describes the difference between precision and accuracy in scientific measurements?

Accepted Answer

Precision refers to how close repeated measurements are to each other, while accuracy refers to how close a measurement is to the true value.

Question 2

A student is conducting an experiment to test the effect of light intensity on the rate of photosynthesis in Elodea. Which is the dependent variable in this experiment?

Accepted Answer

The rate of photosynthesis

Question 3

Which of the following is the correct formula for calculating the density of an object?

Accepted Answer

$$density = \frac{mass}{volume}$$

Question 4

A scientist wants to test the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. What is the purpose of the group that does not receive the fertilizer?

Accepted Answer

It serves as the control group to compare the effect of the fertilizer.

Question 5

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 6

If a solution has a pH of 4, which of the following statements is true?

Accepted Answer

The solution is acidic and has a higher concentration of $$H^+$$ ions than a solution with pH 7.

Question 7

A student measures the mass of a rock as 250 g and its volume as 50 cm$$^3. $$What is the density of the rock?

Accepted Answer

$$5\ g/cm^3$

Question 8

Which of the following best explains why a buffer is important in biological systems?

Accepted Answer

A buffer helps maintain a stable pH by neutralizing added acids or bases.

Question 9

Which of the following is a correct statement about osmosis?

Accepted Answer

Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration.

Question 10

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

Accepted Answer

Water will enter the cell, causing it to swell and possibly burst.

Question 11

Which of the following best describes the function of the condenser in a compound microscope?

Accepted Answer

It focuses light onto the specimen.

Question 12

Which of the following is a correct metric conversion?

Accepted Answer

1 meter = 100 centimeters

Question 13

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 14

A student observes onion cells under a microscope and notices that the cells have a rectangular shape and a visible cell wall. Which type of cell is the student most likely observing?

Accepted Answer

Plant cell

Question 15

Which of the following best describes the process of diffusion?

Accepted Answer

The movement of molecules from an area of high concentration to an area of low concentration.

Question 16

A student adds hydrochloric acid ($$HCl) to a $$beaker of water and measures the pH. Which of the following best explains what happens to the pH?

Accepted Answer

The pH decreases because $$HCl$$ increases the concentration of $$H^+$$ ions.

Question 17

Which of the following is a correct statement about the scientific method?

Accepted Answer

A hypothesis is a testable explanation for an observation.

Question 18

Which of the following best describes the function of a buffer in a biological system?

Accepted Answer

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

Question 19

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink (crenate).

Question 20

Which of the following best explains why cells placed in distilled water may burst?

Accepted Answer

Distilled water is hypotonic, so water enters the cell by osmosis, increasing internal pressure.

General Biology Study Guide: Scientific Method, Chemistry, Microscopy, Cell Structure, and Diffusion

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