Question 1

Which of the following best describes the difference between an ion and an isotope?

Accepted Answer

An ion is an atom or molecule that has gained or lost electrons, resulting in a net electric charge, while an isotope is an atom of the same element with a different number of neutrons.

Question 2

A scientist is studying a radioactive isotope that decays and releases energy. Which of the following best explains why radioactive isotopes are important in biological research?

Accepted Answer

They can be used to trace the movement of substances through metabolic pathways by emitting detectable radiation.

Question 3

Which of the following is NOT a characteristic shared by all living things?

Accepted Answer

Ability to photosynthesize

Question 4

A student is asked to classify a newly discovered organism. It is multicellular, has a nucleus, and performs photosynthesis. To which domain and kingdom does it most likely belong?

Accepted Answer

Domain: Eukarya; Kingdom: Plantae

Question 5

Which of the following best defines a hypothesis in scientific research?

Accepted Answer

A testable or educated guess of the outcome of an experiment or observation based on knowledge

Question 6

Which of the following is a trace element, and why is it important for living organisms?

Accepted Answer

Iron; it is required in minute quantities for physiological functions such as oxygen transport.

Question 7

Which property of water allows it to moderate temperature in living organisms and environments?

Accepted Answer

High specific heat

Question 8

A solution has a pH of 4. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a higher concentration of hydrogen ions ($$\mathrm{H^+}) $$than a solution with pH 7.

Question 9

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

Accepted Answer

Ice is less dense than liquid water due to the formation of a rigid, open hexagonal crystal lattice.

Question 10

Which of the following is the correct order of the taxonomic classification for humans, from most inclusive to least inclusive?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 12

A researcher is designing an experiment to test the effect of a new fertilizer on plant growth. Which of the following is the best example of a control in this experiment?

Accepted Answer

A group of plants that does not receive the new fertilizer but is otherwise treated the same as the experimental group.

Question 13

Which of the following is the best definition of an atom?

Accepted Answer

The smallest unit of matter that still retains the properties of an element.

Question 14

Which of the following is a key difference between a hypothesis and a prediction in scientific research?

Accepted Answer

A hypothesis is a testable, educated guess explaining an observation, while a prediction is a specific, expected outcome based on that hypothesis.

Question 15

Which of the following is NOT a property of water that contributes to its importance for life?

Accepted Answer

Low specific heat

Question 16

How many electrons are found in the first energy shell of an atom?

Accepted Answer

$$2$$

Question 17

Which of the following best describes the scientific method?

Accepted Answer

A systematic process scientists use to acquire knowledge and understand the natural world through observation, experimentation, and the creation of testable explanations.

Question 18

Which of the following is the best example of a well-constructed hypothesis?

Accepted Answer

If fertilizer is added to soil, then plant growth will increase because the fertilizer provides essential nutrients.

Question 19

Which of the following is a function of proteins in living organisms?

Accepted Answer

Catalyzing chemical reactions as enzymes

Question 20

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

It has an uneven distribution of charge, with oxygen being more electronegative than hydrogen, resulting in partial positive and negative ends.

General Biology: Foundations, Classification, Chemistry, and Water

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