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

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Q: A solution has a pH of 4. What is the concentration of H$$^+$$ ions in the solution?

$$1 \times 10$$^{-4}$$\ \text{M}$$

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 measurements are to the true value.

Question 2

A scientist is testing the effect of light intensity on plant growth. Which is the independent variable in this experiment?

Accepted Answer

The light intensity

Question 3

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

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 4

A student measures the mass of a cube as 50 g and its volume as 10 cm$$^3. $$What is the density of the cube?

Accepted Answer

$$5\ 	ext{g/cm}^3$$

Question 5

Which of the following best describes a controlled experiment?

Accepted Answer

An experiment in which all variables are kept constant except the independent variable.

Question 6

Which of the following is NOT a function of the buffer in a biological system?

Accepted Answer

To increase the rate of chemical reactions

Question 7

Which of the following chemical bonds is the strongest in biological molecules?

Accepted Answer

Covalent bond

Question 8

A solution has a pH of 4. What is the concentration of H$$^+$$ ions in the solution?

Accepted Answer

$$1 	imes 10$$^{-4}$$\ 	ext{M}$$

Question 9

Which of the following best explains what happens to a plant cell placed in a hypotonic solution?

Accepted Answer

The cell will gain water and swell, but will not burst due to the cell wall.

Question 10

Which part of the compound microscope is responsible for adjusting the amount of light that reaches the specimen?

Accepted Answer

Diaphragm

Question 11

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

kilo, centi, milli, micro, nano

Question 12

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water molecules from low to high concentration of solute.

Question 13

A scientist wants to determine the effect of salt concentration on the rate of diffusion in potato cells. Which variable should be kept constant to ensure a controlled experiment?

Accepted Answer

Type of potato used

Question 14

Which of the following cell types is classified as a prokaryote?

Accepted Answer

Cyanobacteria

Question 15

Which of the following best describes the function of the mitochondria in eukaryotic cells?

Accepted Answer

Energy production through cellular respiration

Question 16

If a solution is hypertonic compared to a cell, what will happen to the cell?

Accepted Answer

The cell will lose water and shrink.

Question 17

Which of the following is the correct chemical formula for table salt?

Accepted Answer

$$	ext{NaCl}$$

Question 18

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

Accepted Answer

A hypothesis is a testable prediction about what will happen in an experiment.

Question 19

A student observes that a cell placed in a solution shrivels and loses water. What type of solution is the cell in?

Accepted Answer

Hypertonic

Question 20

Which of the following best explains why buffers are important in biological systems?

Accepted Answer

Buffers prevent drastic changes in pH, allowing enzymes and other biological molecules to function properly.

General Biology Study Guide: Scientific Method, Chemistry, Cells, and Microscopy

Guida di studio - Domande di pratica

Study guide - Flashcard