MCA Biology MN

Front

What is the cell theory?

Back

The cell theory states that: 1) All living organisms are composed of one or more cells. 2) The cell is the basic unit of life. 3) All cells arise from pre-existing cells.

Front

Define photosynthesis.

Back

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose, using carbon dioxide and water.

Front

What is the function of mitochondria?

Back

Mitochondria are known as the powerhouse of the cell; they generate ATP (adenosine triphosphate), which is used as energy currency in cellular processes.

Front

Explain the role of enzymes in biological reactions.

Back

Enzymes are biological catalysts that speed up chemical reactions in cells by lowering the activation energy required for the reaction to occur.

Front

What is the difference between prokaryotic and eukaryotic cells?

Back

Prokaryotic cells lack a nucleus and membrane-bound organelles, while eukaryotic cells have a nucleus and membrane-bound organelles.

Front

Define homeostasis.

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

Front

What is the significance of the plasma membrane?

Back

The plasma membrane controls the movement of substances in and out of the cell, maintaining the cell's internal environment and facilitating communication with other cells.

Front

What are the main stages of the cell cycle?

Back

The main stages of the cell cycle are Interphase (G1, S, G2) and Mitotic phase (Mitosis and Cytokinesis).

Front

Explain the process of cellular respiration.

Back

Cellular respiration is the process by which cells convert glucose and oxygen into energy (ATP), carbon dioxide, and water.

Front

What is genetic variation and why is it important?

Back

Genetic variation refers to the differences in DNA among individuals. It is important for evolution and adaptation to changing environments.