Question 1

Which of the following best illustrates the concept of emergent properties in biology?

Accepted Answer

A functioning heart can pump blood, but individual heart cells cannot.

Question 2

A scientist is testing the effect of sunlight on plant growth. She grows one group of plants in full sunlight and another group in the shade, keeping all other conditions the same. In this experiment, what is the independent variable?

Accepted Answer

Amount of sunlight

Question 3

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element contains only one type of atom, while a compound contains two or more different elements chemically bonded.

Question 4

Which of the following is the correct order of the levels of biological organization from smallest to largest?

Accepted Answer

Atom → Molecule → Cell → Organism → Ecosystem → Biosphere

Question 5

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 6

A researcher wants to test a new drug's effect on blood pressure. She gives the drug to one group and a placebo to another, measuring blood pressure in both groups. What is the dependent variable in this experiment?

Accepted Answer

The blood pressure measured

Question 7

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

Accepted Answer

Oxygen is more electronegative than hydrogen, creating an unequal sharing of electrons.

Question 8

Which of the following is an example of a hydrogen bond?

Accepted Answer

The attraction between the hydrogen of one water molecule and the oxygen of another water molecule.

Question 9

Which domain of life includes organisms that have membrane-bound organelles?

Accepted Answer

Eukarya

Question 10

Which of the following best describes natural selection?

Accepted Answer

The process by which individuals with advantageous traits survive and reproduce more successfully.

Question 11

A neutral atom of carbon has an atomic number of 6 and a mass number of 12. How many neutrons does it have?

Accepted Answer

$$12 - 6 = 6$$ neutrons

Question 12

Which of the following best defines homeostasis?

Accepted Answer

The ability of an organism to maintain a stable internal environment despite external changes.

Question 13

Which of the following is the correct way to write the scientific name for humans using binomial nomenclature?

Accepted Answer

Homo sapiens

Question 14

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms.

Question 15

A sodium atom has 11 protons and 11 electrons. If it loses one electron to form a sodium ion, what is the charge of the ion?

Accepted Answer

$$+1$$

Question 16

Which of the following best describes the role of valence electrons in chemical reactivity?

Accepted Answer

Valence electrons determine how an atom interacts and bonds with other atoms.

Question 17

Which of the following is an example of adaptation?

Accepted Answer

A polar bear's thick fur helps it survive in cold environments.

Question 18

Which of the following best explains why ionic bonds form between sodium and chlorine to make table salt (NaCl)?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 19

Which of the following best describes gene expression?

Accepted Answer

The process by which information from a gene is used to synthesize a functional product, such as a protein.

Question 20

A scientist observes that a certain chemical reaction occurs faster when the reactants are dissolved in water. Which property of water is most likely responsible for this observation?

Accepted Answer

Water's polarity allows it to dissolve many substances, increasing the frequency of molecular collisions.

Study Guide: Introduction to Biology and the Chemical Context of Life

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