Exploring 12th Grade Biology Concepts

What is the basic unit of life?

• Tissue

• Cell

• Organism

• Organ

Explain the process of mitosis.

• Mitosis occurs only in prokaryotic cells.

• Mitosis is the process of cell division that results in two identical daughter cells through stages: Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis.

• Mitosis is the process of protein synthesis in cells.

• Mitosis results in three daughter cells instead of two.

What is the role of DNA in heredity?

• DNA is the molecule that carries genetic information and is responsible for heredity.

• DNA is responsible for producing energy in cells.

• DNA is only found in the nucleus of a cell.

• DNA has no role in determining traits.

Define genotype and phenotype.

• Genotype refers to the physical appearance of an organism; phenotype is the genetic information.

• Genotype is the sum of all environmental influences on an organism; phenotype is the DNA sequence.

• Genotype is the observable characteristics; phenotype is the underlying genetic structure.

• Genotype is the genetic makeup of an organism; phenotype is the observable traits resulting from that genotype.

Describe the structure and function of the human heart.

• The heart has three chambers and circulates lymph fluid.

• The human heart has four chambers (right atrium, right ventricle, left atrium, left ventricle) and functions to pump blood throughout the body, facilitating oxygen delivery and carbon dioxide removal.

• The heart is located in the brain and regulates temperature.

• The heart functions solely to digest food and absorb nutrients.

What are the main functions of the respiratory system?

• Nutrient absorption

• Hormone production

• Waste filtration

• The main functions of the respiratory system are gas exchange, regulation of blood pH, and facilitating breathing.

Explain photosynthesis and its importance in plants.

• Photosynthesis produces carbon dioxide and water as byproducts.

• Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen, which are vital for their growth and for life on Earth.

• Photosynthesis is the process of plants absorbing nutrients from the soil.

• Photosynthesis occurs only at night in plants.

What is the role of chlorophyll in plant physiology?

• Chlorophyll is responsible for the plant's structural support.

• Chlorophyll enables photosynthesis by absorbing light energy for converting carbon dioxide and water into glucose.

• Chlorophyll protects plants from harmful UV radiation.

• Chlorophyll helps in water absorption for root growth.

How do hormones regulate human metabolism?

• Hormones have no impact on energy levels.

• Hormones only affect mood and emotions.

• Hormones solely regulate body temperature.

• Hormones regulate human metabolism by controlling energy storage and expenditure through mechanisms like glucose uptake, fat metabolism, and overall metabolic rate.

What is the significance of genetic variation in a population?

• Genetic variation enhances adaptability and survival of a population.

• Genetic variation leads to uniformity in traits.

• Genetic variation has no impact on population dynamics.

• Genetic variation decreases the chances of survival.