Q: A student is asked to calculate the mass number of an atom with 6 protons and 8 neutrons. Which equation should they use, and what is the correct answer?

$$\text{Mass number} = \text{protons} + \text{neutrons}$$, so $$6 + 8 = 14$$

Question 1

A scientist is testing the effect of sunlight on plant growth. She places one group of plants in full sunlight and another group in the shade, measuring the height of each plant after two weeks. In this experiment, what is the dependent variable?

Accepted Answer

The height of the plants after two weeks

Question 2

Which of the following best describes a scientific theory?

Accepted Answer

A broad explanation supported by a large body of evidence

Question 3

A double-blind experiment is designed to minimize which of the following?

Accepted Answer

Bias from both experimenters and subjects

Question 4

Which of the following is NOT one of the four elements that make up most living matter?

Accepted Answer

Calcium

Question 5

A student claims that drinking a certain herbal tea improves memory. To scientifically test this claim, which of the following would be the best hypothesis?

Accepted Answer

Drinking herbal tea will increase memory test scores compared to not drinking it.

Question 6

Which of the following best distinguishes a compound from an element?

Accepted Answer

A compound is made of two or more different elements bonded together, while an element is made of only one kind of atom.

Question 7

Which of the following is a property of water that results from hydrogen bonding and is crucial for life on Earth?

Accepted Answer

Ice floats on liquid water.

Question 8

A researcher is designing an experiment to test a new drug. She wants to ensure that neither the participants nor the researchers know who is receiving the drug or the placebo. What type of experiment is this?

Accepted Answer

Double-blind experiment

Question 9

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are chains of monomers linked together.

Question 10

Which of the following is an example of a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 11

A student is asked to calculate the mass number of an atom with 6 protons and 8 neutrons. Which equation should they use, and what is the correct answer?

Accepted Answer

$$	ext{Mass number} = 	ext{protons} + 	ext{neutrons}$$, so $$6 + 8 = 14$$

Question 12

Which of the following is a correct example of a covalent bond?

Accepted Answer

Water (H$$_2O)$$

Question 13

Which of the following is a characteristic of pseudoscience?

Accepted Answer

It lacks empirical support and proper methodology.

Question 14

Which of the following best describes the role of proteins in living organisms?

Accepted Answer

They do jobs such as building body parts and acting as enzymes.

Question 15

Which of the following is an example of a controlled variable in an experiment testing the effect of fertilizer on plant growth?

Accepted Answer

The type of plant used in all groups

Question 16

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules further apart in the solid state.

Question 17

Which of the following is a correct sequence in the flow of genetic information in a cell?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 18

A student is asked to identify the independent variable in an experiment where different amounts of fertilizer are added to plants to measure their growth. Which is the independent variable?

Accepted Answer

The amount of fertilizer added

Question 19

Which of the following is an example of a disaccharide?

Accepted Answer

Sucrose

Question 20

Which of the following best describes the main function of lipids in living organisms?

Accepted Answer

They store energy and form cell membranes.

General Biology: Foundations, Chemistry of Life, and Biological Molecules

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