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

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

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 medication and uses a group that receives a sugar pill instead of the actual drug. What is this group called?

Accepted Answer

Placebo group

Question 3

Which of the following is NOT a subatomic particle found in atoms?

Accepted Answer

Isotope

Question 4

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}$$ \, 	ext{M}$$

Question 5

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 6

Which property of water allows it to move upward through the vessels of a plant against gravity?

Accepted Answer

Cohesion

Question 7

A patient is diagnosed with diabetes, a disease related to the regulation of blood glucose. Which type of biological macromolecule is glucose?

Accepted Answer

Carbohydrate

Question 8

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming a bilayer that separates the cell from its environment.

Question 9

Which organelle is responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondrion

Question 10

A scientist wants to test 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 group that does NOT receive the fertilizer called?

Accepted Answer

Control group

Question 11

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

They lower the activation energy required for chemical reactions.

Question 12

Which of the following is a polymer made up of amino acid monomers?

Accepted Answer

Protein

Question 13

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

Accepted Answer

A hypothesis is a testable explanation for an observation, while a theory is a well-supported explanation based on a large body of evidence.

Question 14

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds between carbon atoms, allowing them to pack closely together.

Question 15

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion or delivery to other organelles.

Question 16

A cell is observed to have a cell wall, chloroplasts, and a large central vacuole. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 17

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules across a membrane through a protein channel, down their concentration gradient, without energy input.

Question 18

Which of the following is an example of a primary source in scientific research?

Accepted Answer

A peer-reviewed research article presenting original experimental data.

Question 19

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 dissolve other polar and ionic substances.

Question 20

A scientist is evaluating a claim that a new herbal supplement cures the common cold. Which of the following is an example of pseudoscience in this context?

Accepted Answer

The claim is based on anecdotal evidence without controlled experiments.

General Biology Study Notes: Introduction to Life, Chemistry of Life, and the Cell

Guida di studio - Domande di pratica

Study guide - Flashcard