Тест: Fundamentals of Biological and Chemical Systems — 4 въпроса

1. What are neurotransmitters?

A. Chemical messengers released into the bloodstream for slow regulation

B. Chemicals that transmit signals across synapses between neurons

C. A network coordinating immediate responses in the body

D. Rapid electrical signals transmitted through neurons

Answer: (B)

Обяснение

Neurotransmitters are defined as chemicals that transmit signals across synapses between neurons, distinguishing them from hormones or electrical signals. Review: Nervous and hormonal system functions and interactions. Course evidence: "- Nervous system: biological network that transmits rapid electrical signals through neurons to coordinate immediate responses. - Hormonal system: network that releases chemical messengers (hormones) into the bloodstream for slower, longer-lasting…"

2. What does fermentation primarily involve?

A. Photosynthesis converting light into chemical energy

B. Anaerobic conversion of sugars into energy and byproducts like alcohol or lactic acid

C. Aerobic breakdown of proteins into amino acids

D. Oxidation of fats in the presence of oxygen

Answer: (B)

Обяснение

Fermentation is defined as an anaerobic process converting sugars into energy and byproducts such as alcohol or lactic acid, distinguishing it from aerobic or photosynthetic processes. Review: Fermentation processes and applications. Course evidence: "Fermentation: anaerobic process converting sugars into energy and byproducts like alcohol or lactic acid."

3. What does equilibrium mean in the context of biological and chemical systems?

A. A state where forward and reverse processes occur at equal rates, resulting in stable concentrations

B. A state in which substances accumulate indefinitely in one phase without change

C. A condition where only forward reactions occur without any reverse process

D. The process by which substances spread until evenly distributed across compartments

Answer: (A)

Обяснение

Equilibrium is defined as the state where forward and reverse processes occur at equal rates, resulting in stable concentrations, distinguishing it from mere distribution or unidirectional processes. Review: Distribution and equilibrium principles in biological and chemical systems. Course evidence: "Equilibrium: state where forward and reverse processes occur at equal rates, resulting in stable concentrations."

4. Which of the following is a factor that influences the rate of a chemical reaction?

A. Molecular color

B. Atomic mass

C. Surface area

D. Electrical conductivity

Answer: (C)

Обяснение

The source states that reaction speed depends on factors like temperature, concentration, surface area, and catalysts. Surface area is explicitly listed, while atomic mass, molecular color, and electrical conductivity are not mentioned as factors affecting reaction rate. Review: Atoms and rate of reaction speed. Course evidence: "Reaction speed depends on factors like temperature, concentration, surface area, and catalysts."