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What is the meaning of metabolism in biology?

Metabolism: The whole range of biochemical processes that occur within a living organism. Metabolism consists of anabolism (the buildup of substances) and catabolism (the breakdown of substances). The term metabolism is commonly used to refer specifically to the breakdown of food and its transformation into energy.

What is growth in biology class 11?

Solution: Growth is defined as a vital process which brings about an irreversible and permanent change in the shape, size, form, weight and volume of a cell, organ or whole organism, accompanied with increase in dry matter. … Growth rate is defined as the increased growth per unit time.

What is mycoplasma 11?

Mycoplasma (plural mycoplasmas or mycoplasmata) is a genus of bacteria that lack a cell wall around their cell membranes. This characteristic makes them naturally resistant to antibiotics that target cell wall synthesis (like the beta-lactam antibiotics). They can be parasitic or saprotrophic.

What is Heterocyst 11?

A heterocyst is a differentiated cyanobacterial cell that carries out nitrogen fixation. The heterocysts function as the sites for nitrogen fixation under aerobic conditions. They are formed in response to a lack of fixed nitrogen (NH4 or NO3).

What is Mycoplasma Class 9?

Mycoplasmas are the smallest and the simplest organisms. They are prokaryotes having nucleoid. They have heterotrophic mode of nutrition and their body can change forms easily. They are also called as MLO, i.e., Mycoplasma Like Organisms.

What is the difference between Pplo and mycoplasma?

Yes, the terms Mycoplasma and PPLO refer to the same kind of organism. Pleuropneumonia-like organism, or PPLO for short, was the first name used to describe them in the 1930s (1). Mycoplasma is the genus of these types of organisms. … Since Mycoplasma lack rigid cell walls, they can contort into different shapes.

Where is Mycoplasma found?

The primary habitats of human and animal mycoplasmas are the mucous surfaces of the respiratory and urogenital tracts and the joints in some animals. Although some mycoplasmas belong to the normal flora, many species are pathogens, causing various diseases that tend to run a chronic course (Fig. 37-4).

Which disease is caused by mycoplasma?

Mycoplasma pneumoniae Infection The most common illness caused by these bacteria, especially in children, is tracheobronchitis (chest cold). Lung infections caused by M. pneumoniae are sometimes referred to as “walking pneumonia” since symptoms are generally mild.

Which is the smallest cell?


Who is largest cell?


Which cell is the longest?

Nerve cells

Why do cells stay small?

The important point is that the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. … That is why cells are so small.

Who discovered cell?

Robert Hooke

Whats is a cell?

Cells are the basic building blocks of all living things. … Cells also contain the body’s hereditary material and can make copies of themselves. Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.

What is an example of cell?

Trees in a forest, fish in a river, horseflies on a farm, lemurs in the jungle, reeds in a pond, worms in the soil — all these plants and animals are made of the building blocks we call cells. Like these examples, many living things consist of vast numbers of cells working in concert with one another.

What is cell life?

Anatomical terminology. The cell (from Latin cella, meaning “small room”) is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the “building blocks of life“. The study of cells is called cell biology, cellular biology, or cytology.

What is Cell Class 11?

A cell is defined as the most basic, structural and functional unit of all living organisms. Essentially, a cell is a structure that contains organelles which provide necessary functions to sustain itself. … Plants have cells that are vastly different from animals.

Who gave cell theory 11?

The cell consists of, Cell membrane, Cell wall, Nucleus, Cell organelles and Cytoplasm. Now, coming to cell theory, the cell theory was proposed by Matthias Schleiden, RUdolf Virchow and Theodor Schwann.

What is Cell Class 9?

“A cell is defined as the smallest, basic unit of life that is responsible for all of life’s processes.” … Hence, they are known as the building blocks of life. Each cell contains a fluid called the cytoplasm, which is enclosed by a membrane.

What is known as unit of life?

The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life. Some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.

Where do all cells come from?

Matthias Schleiden and Theodor Schwann conclude that all living organisms are made of cells, and that cells can be produced from other cells. Rudolf Virchow confirms that all cells must come from pre-existing cells.