4. Cell-Structure and function(8)

fact

Golgi body, lysosomes and endoplasmic reticulum are single membrane bound organelles.

In plant cells vacuoles are present. All other statements are correct.

fact

Long extensions of nerve cell help in transmission of nerve impulses.

These parts are not present in an animal cell.

 Antony von Leeuwenhoek saw the first living cell under the microscope. Theodore Schwann said that all living things are made of cells.

Lysosomes- Structurally and chemically, they are spherical vesicles containing hydrolytic enzymes capable of breaking down virtually all kinds of biomolecules, including proteins, nucleic acids, carbohydrates,lipids, and cellular debris.

Plasma membrane is selectively permeable and is made up of lipids.

Entry and exit of materials-cell membrane, production of energy-mitochondria, secretion of enzymes and proteins- Golgi apparatus

Mitochondria is involved in ATP synthesis that is used up as an energy requirement by the cells.

Hypotonic refers to a lesser concentration. In biology, a hypotonic solution has a lower concentration of solutes outside the cell than inside the cell. In an attempt to balance the concentrations of solutes inside and outside the cell, water will rush into the cell, and can cause it to burst.

fact

fact

Ribosome is the only non-membranous organelle in both prokaryotes and eukaryotes.

The Golgi body has a number of functions, including sorting and processing proteins. Proteins are synthesized in the rough endoplasmic reticulum, then they travel to the Golgi body. While in the Golgi body, they are processed and sent throughout the cell. The Golgi body is also responsible for determining which proteins are to be transported outside the cell.

hypotonic solution, meaning it has less solute and more water than another solution. a hypertonic solution, meaning it has more solute and less water than another solution.

The nucleus in prokaryotes is not surrounded by a nuclear membrane.

Chloroplast are the organelles which contain chlorophyll pigment which helps in photosynthesis in plants.

A semi-permeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a type of biological membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized facilitated diffusion, along with other types of passive transport and active transport.