QCM : Fundamentals of Cell Structure and Organ Systems — 6 questions

Explication

The source states that by regulating the movement of nutrients, gases, and waste products, the cell membrane ensures the cell maintains a suitable internal environment for its activities. This is the direct consequence of its regulatory function. Review: Cell structure and function. Course evidence: "The cell membrane functions as a control point for substances entering and leaving the cell. It regulates the movement of nutrients, gases, and waste products, ensuring the cell maintains a suitable internal environment for its activities."

Explication

An organ system is defined as a group of multiple organs coordinating their activities to perform complex functions essential for survival, as described in the source excerpt. The other options define organs, tissues, and specialised cells respectively, which are different organizational levels. Review: Organisation of organisms and organ systems. Course evidence: "An organ system is a group of multiple organs that coordinate their activities to carry out complex functions necessary for the organism’s survival. These systems work as integrated units; for instance, the circulatory system includes the heart, blood…"

Explication

Vaccination introduces a harmless form of a pathogen, stimulating white blood cells to produce antibodies and develop immunity, enabling a faster and more effective response upon future exposure. Review: Infection and response to pathogens. Course evidence: "Vaccination involves introducing a harmless form of a pathogen into the body. This stimulates the white blood cells to produce antibodies against the pathogen's antigens. As a result, the body develops immunity, allowing it to respond more rapidly and…"

Explication

The source states that the rate of photosynthesis is influenced by light intensity, carbon dioxide concentration, and temperature. Oxygen concentration and glucose availability are not listed as factors affecting photosynthesis rate, nor is water pH level. Review: Bioenergetics: photosynthesis and respiration. Course evidence: "The rate at which photosynthesis occurs is influenced by several factors, including light intensity, the concentration of carbon dioxide, and temperature. Increased light intensity provides more energy for the process, higher carbon dioxide levels supply…"

Explication

Hormones released into the bloodstream regulate slower, longer-term processes like growth and metabolism, as stated in the source. Rapid electrical signals and immediate muscle responses are functions of the nervous system, not hormones. Review: Homeostasis, the nervous system, and hormonal coordination. Course evidence: "Hormones are chemical messengers that are released into the bloodstream by glands. Unlike electrical impulses, hormones tend to regulate slower, longer-term processes within the body. They coordinate activities such as growth, metabolism, and reproductive…"

Explication

Mutations cause changes in the DNA sequence that introduce new genetic variation by creating new alleles, which can affect traits in organisms. This is a key source of genetic diversity necessary for evolution. Review: Inheritance, variation, and evolution. Course evidence: "Mutations are changes in the DNA sequence that can occur spontaneously or due to external factors. These changes can introduce new genetic variation by creating new alleles, potentially affecting traits in an organism."