Question 1

Which of the following best describes the hierarchical organization of life from smallest to largest?

Accepted Answer

Atom → Molecule → Organelle → Cell → Tissue → Organ → Organism → Population → Community → Ecosystem → Biosphere

Question 2

A scientist is testing 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 control group in this experiment?

Accepted Answer

The group that does not receive the fertilizer

Question 3

Which property of water allows it to moderate temperature in living organisms, and what causes this property?

Accepted Answer

High specific heat, caused by hydrogen bonding between water molecules

Question 4

Which of the following statements about the four most common elements in living organisms is correct?

Accepted Answer

Carbon, hydrogen, oxygen, and nitrogen make up the majority of living matter

Question 5

A molecule of water ($$\mathrm{H_2O}) $$forms hydrogen bonds with other water molecules. Which statement best explains this phenomenon?

Accepted Answer

The polarity of water molecules allows the partially positive hydrogen of one molecule to be attracted to the partially negative oxygen of another

Question 6

Which of the following best describes the difference between a hypothesis and a scientific theory?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a well-supported explanation based on evidence

Question 7

Which of the following is a trace element required by humans and what is its primary biological role?

Accepted Answer

Iron; it is essential for oxygen transport in hemoglobin

Question 8

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons

Question 9

A solution has a pH of 4. What is the concentration of hydrogen ions ($$[\mathrm{H^+}]) in $$this solution?

Accepted Answer

$$[\mathrm{H^+}] = 10$$^{-4}$$\ \mathrm{M}$$

Question 10

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-\mathrm{COOH})$$

Question 11

Which of the following best explains why cellulose (fiber) cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to break the $$\beta-1$$,4-glycosidic bonds in cellulose

Question 12

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is composed of a phospholipid bilayer with embedded proteins, allowing selective permeability

Question 13

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

Accepted Answer

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

Question 14

Which of the following best describes the primary function of ribosomes in a cell?

Accepted Answer

Synthesizing proteins by linking amino acids together

Question 15

Which of the following is a property of unsaturated fats that distinguishes them from saturated fats?

Accepted Answer

They contain one or more double bonds in their fatty acid chains, causing kinks

Question 16

Which of the following best describes the process of protein denaturation?

Accepted Answer

Loss of a protein's three-dimensional structure due to disruption of non-covalent interactions

Question 17

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of reactions by binding substrates at their active site

Question 18

Which of the following best explains why oxygen ($$\mathrm{O_2$}) $$can diffuse easily across the plasma membrane, but glucose cannot?

Accepted Answer

Oxygen is small and nonpolar, while glucose is large and polar

Question 19

Which of the following is a correct pairing of a monomer and its corresponding polymer?

Accepted Answer

Nucleotide and nucleic acid

Question 20

A scientist observes that a certain protein loses its function when exposed to high temperatures. Which level(s) of protein structure are most likely disrupted?

Accepted Answer

Secondary, tertiary, and quaternary structures

Exam 1 Study Guide: Foundations of Biology, Chemistry of Life, and Cell Structure

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