Cell Biology and Structure

Plant cells contain chloroplasts for photosynthesis and mitochondria for cellular respiration.

Centrioles are typically found in animal cells to assist in cell division, but they are generally absent in most plant cells.

Large central vacuoles are a characteristic feature of plant cells, providing structural support and storage; they are not found in animal cells.

Chloroplasts are the organelles in plant cells that capture light energy and convert it into chemical energy through photosynthesis.

Animal cells lack chloroplasts because they do not perform photosynthesis; they obtain energy by consuming organic matter.

The cell membrane is primarily composed of a phospholipid bilayer, which provides a flexible and selective barrier.

Proteins synthesized in the rough endoplasmic reticulum are transported to the Golgi apparatus for modification, sorting, and packaging. The Golgi acts as the post office of the cell.

The cytoskeleton is a network of protein filaments that provides structural support and shape to the cell. It also plays a crucial role in cell movement and intracellular transport.

The nucleolus is a dense region within the nucleus where ribosomal RNA (rRNA) is synthesized and combined with proteins to begin ribosome assembly.

Ribosomes are the cellular machinery responsible for protein synthesis, or translation. They read mRNA sequences to assemble amino acids into polypeptide chains.

Vacuoles are membrane-bound sacs used for storage of various substances, including water, nutrients, and waste products. In plant cells, the central vacuole is particularly large.

The nucleus is the membrane-bound organelle that protects and contains the cell's genetic material, DNA, in eukaryotic cells.

In eukaryotic cells, DNA is stored within the nucleus, and therefore DNA replication takes place inside the nucleus.

The human egg (ovum) is the largest cell in the body and can be seen without the aid of a microscope. It is one millimeter in diameter. Whereas, a nerve cell is the longest cell in human body.

The first cell was observed and named by Robert Hooke in 1665. He described that it looked like cellula, small rooms which are inhabited by monks hence derived the name 'cell'. The cell he actually saw was the dead cell walls of the plant (cork) under a microscope. Hooke described the characteristics of a cell he observed in his book 'Micrographia'.