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

$$[H^+] = 1 \times 10$$^{-4}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes an emergent property in biology?

Accepted Answer

A property that arises from the interaction of simpler components, such as consciousness emerging from neural networks.

Question 2

A scientist is testing a new drug to treat diabetes. She divides patients into two groups: one receives the drug, and the other receives a sugar pill. Neither the patients nor the doctors know who receives which treatment. What type of experiment is this?

Accepted Answer

Double-blind placebo-controlled trial

Question 3

Which of the following statements about scientific theories is correct?

Accepted Answer

A scientific theory is a well-supported explanation that unifies a broad range of observations and experiments.

Question 4

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is a polar molecule, allowing it to form hydrogen bonds with ions and other polar substances.

Question 5

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

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ \mathrm{M}$$

Question 6

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond involves the sharing of electrons, while an ionic bond involves the transfer of electrons.

Question 7

Which macromolecule is correctly matched with its monomer?

Accepted Answer

Protein – Amino acid

Question 8

A patient is diagnosed with lactose intolerance. Which type of macromolecule is the enzyme lactase responsible for breaking down?

Accepted Answer

Carbohydrate

Question 9

Which of the following best explains why trans fats are considered unhealthy compared to unsaturated fats?

Accepted Answer

Trans fats increase LDL ("bad") cholesterol and decrease HDL ("good") cholesterol, raising the risk of heart disease.

Question 10

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed.

Question 11

A cell is placed in a solution and water moves into the cell, causing it to swell. What type of solution is the cell in?

Accepted Answer

Hypotonic solution

Question 12

Which organelle is responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondrion

Question 13

Which of the following best describes the structure of the plasma membrane?

Accepted Answer

A fluid mosaic of phospholipids and proteins arranged in a bilayer

Question 14

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 15

A scientist observes that a certain protein is synthesized in the rough endoplasmic reticulum and then modified and packaged for export. Which organelle is responsible for this modification and packaging?

Accepted Answer

Golgi apparatus

Question 16

Which of the following is a correct sequence of biological organization from smallest to largest?

Accepted Answer

Atom → Molecule → Organelle → Cell → Tissue → Organ → Organ system → Organism

Question 17

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 18

Which of the following best explains why cellulose is indigestible to most animals?

Accepted Answer

Most animals lack the enzyme to break the $$\beta-$$glycosidic bonds in cellulose.

Question 19

A patient is found to have a mutation in the gene encoding a lysosomal enzyme. Which cellular process is most likely to be affected?

Accepted Answer

Breakdown of macromolecules and cellular debris

Question 20

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

Accepted Answer

Ribosomes synthesize proteins by translating mRNA.

Unit I Study Notes: Introduction to Biology, Chemistry of Life, and The Cell

Study Guide - Practice Questions

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