In biology, the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm.
What is a cell in science?
Listen to pronunciation. (sel) In biology, the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body . A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm.
What is a cell answer?
“A cell is defined as the smallest, basic unit of life that is responsible for all of life’s processes .” Cells are the structural, functional, and biological units of all living beings. A cell can replicate itself independently. Hence, they are known as the building blocks of life.
Is a cell or organelle?
Cells are membrane-bound groups of organelles that work together to allow it to function. Some of the major organelles include the nucleus, mitochondria, lysosomes, the endoplasmic reticulum, and the Golgi apparatus. Plant cells also include chloroplasts, which are responsible for photosynthesis.
What is a cell or not?
A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Most cells have one or more nuclei and other organelles that carry out a variety of tasks.
What is example of cell?
A cell is defined as the smallest unit of an organism with a nucleus. An example of a cell is a unit in the tissue of an animal muscle . A small enclosed cavity or space, such as a compartment in a honeycomb or within a plant ovary or an area bordered by veins in an insect’s wing.
What is the smallest cell?
As of today, the mycoplasmas are thought to be the smallest living cells in the biological world (Fig. 1). They have a minimal size of approximately 0.2 micrometers, which makes them smaller than some of the poxviruses.
Which organelle is called suicidal bags of cell?
50 years ago, Christian de Duve introduced the term “suicide bags” to describe lysosomes (1), the organelles containing numerous hydrolases, which were, until the discovery of the ubiquitin-proteasome system, thought to be responsible for the major part of the intracellular turnover of proteins and other macromolecules ...
Who discovered cell?
Initially discovered by Robert Hooke
What are the major parts of cell?
A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm . Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of miniscule but distinct structures called organelles.
What’s inside a cell?
A cell consists of a nucleus and cytoplasm and is contained within the cell membrane, which regulates what passes in and out. The nucleus contains chromosomes, which are the cell’s genetic material, and a nucleolus, which produces ribosomes. ... The endoplasmic reticulum transports materials within the cell.
What is cell made up of?
All cells are made from the same major classes of organic molecules : nucleic acids, proteins, carbohydrates, and lipids.
What is a cell class 9?
“A cell is defined as the smallest, basic unit of life that is responsible for all of life’s processes .” Cells are the structural, functional, and biological units of all living beings. A cell can replicate itself independently. Hence, they are known as the building blocks of life.
Is DNA a cell?
In organisms called eukaryotes, DNA is found inside a special area of the cell called the nucleus. Because the cell is very small, and because organisms have many DNA molecules per cell, each DNA molecule must be tightly packaged. ... During DNA replication, DNA unwinds so it can be copied.
What are the two types of cell?
Types of Cells. Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic cells , which do not have a nucleus, but a nucleoid region is still present. Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular.
What is a cell one word answer?
Answer: A cell is the structural and functional unit of an organism . Cells in different organisms show variation in their shape, size and number.
