Mock STAAR 2024

Front

What is unregulated cell division?

Back

Unregulated cell division is a characteristic of cancer cells where cells divide uncontrollably, leading to tumor formation.

Front

What is the significance of phenotype distribution in evolution?

Back

Phenotype distribution refers to the variation in physical traits within a population, which can change due to environmental factors, influencing natural selection.

Front

What does it mean for an enzyme to be denatured?

Back

Denaturation of an enzyme occurs when its structure is altered, usually due to extreme temperature or pH, rendering it inactive.

Front

What is vasodilation?

Back

Vasodilation is the widening of blood vessels, which decreases blood pressure and increases blood flow to tissues.

Front

What is vasoconstriction?

Back

Vasoconstriction is the narrowing of blood vessels, which increases blood pressure and reduces blood flow to tissues.

Front

Where does DNA replication occur in a cell?

Back

DNA replication occurs in the nucleus of eukaryotic cells during the S phase of the cell cycle.

Front

What is the role of rennin in digestion?

Back

Rennin is an enzyme that helps in the digestion of milk by coagulating it, making it easier for the body to process.

Front

What is a feedback mechanism in biological systems?

Back

A feedback mechanism is a process that regulates biological functions by using the output of a system to control its input, maintaining homeostasis.

Front

What is the difference between somatic cells and gametes?

Back

Somatic cells are body cells that contain a full set of chromosomes, while gametes are reproductive cells (sperm and eggs) that contain half the number of chromosomes.

Front

What is the function of mitochondria in cells?

Back

Mitochondria are known as the powerhouse of the cell, as they produce energy (ATP) through cellular respiration.