Cell Biology and Structure

Mitochondria are present in all eukaryotic cells (yeast, fungi, algae) but absent in prokaryotic cells like bacteria. Bacteria lack membrane-bound organelles entirely. The question contains a typo ('cellls' should be 'cells') and option D has odd formatting ('Algae A' instead of just 'Algae').

Bone marrow contains large populations of hematopoietic stem cells that continuously produce blood cells throughout life. While stem cells exist in many tissues, bone marrow is the richest source in the adult human body and is routinely harvested for medical treatments.

The cell is the basic structural and functional unit of all living organisms. Cells are the smallest units that can carry out all life processes including reproduction, metabolism, and response to stimuli. Genes, chromosomes, and organelles are all components within cells.

Red blood cells (erythrocytes) are the smallest cells in the human body, measuring about 6-8 micrometers in diameter. They are responsible for carrying oxygen throughout the body. Their small size allows them to pass through the tiniest blood vessels (capillaries) to deliver oxygen to tissues.

Cells are indeed the fundamental structural and functional units of the human body. All tissues and organs are composed of cells, which perform all basic life processes. This is a foundational concept in biology.

Hair is the fastest-growing tissue in the human body, growing about 1.25 cm per month. This outpaces nails and skin regeneration rates. The growth occurs in hair follicles through rapid cell division in the matrix.

This statement is correct. Neurons (brain cells) can indeed survive and function for a person's entire lifetime, making them among the longest-living cells in the human body. Unlike most other cell types that regularly undergo cell division and replacement, most neurons are post-mitotic, meaning they don't divide after formation. While some neurons do die with aging or injury, many cerebral cortex neurons persist from birth until death, potentially living 80-100+ years. This longevity is why brain injuries are so devastating - lost neurons typically aren't replaced.

Plant cells are the only option among these that contain both plastids (like chloroplasts for photosynthesis) and large central vacuoles. Plastids are membrane-bound organelles unique to plant and algal cells, while vacuoles store water, nutrients, and help maintain cell structure.

Excel uses a colon (:) to specify ranges. The format is always top-left cell:bottom-right cell. For a range starting at B1 and extending to G10, the correct notation is B1:G10.

T.H. Huxley, the prominent 19th-century biologist, famously described protoplasm as 'the physical basis of life' in his 1868 address to the British Association. This concept emphasized that living matter had a physical, material basis rather than a vitalistic one. Leeuwenhoek discovered microorganisms, Virchow formulated cell theory, and J.C. Bose worked on plant physiology.

It is a function of connective tissue.

The shape and structure of a cell depends on the functions that it performs. 

Lysosome is a single membrane-bound cell organelle.

DNA (Deoxyribonucleic acid) is present in the nucleus of the cell. Along with nucleus, DNA is also present in mitochondria and chloroplast, but not in golgi apparatus, ribosome and vacuole.