Question

Endoskeleton of the cell is :
1) Centrioles
3) Chromatin
2) ER
4) Golgi bodies​

Answer 1

Answer:

3) ER

Explanation:

IS THE ENDOSKELETON OF THE CELL

Answer 2

Answer:

Cell

Cell membrane

Nucleus: Nuclear Envelope, Nucleoplasm and Chromatin (DNA + Histones)

Cytoplasm: Cytosol and Cell Organelles

Cell Division

Cell Cycle

Mitosis: division of nucleus

Cytokinesis: division of cytoplasm

Cell Theory

4 basic concepts of cell theory are:

Cells are the units of structure (building blocks) of all organisms

Cells are the smallest unit of function in all organisms

Cells originate only from pre-existing cells by cell division.

All cells maintain homeostasis (internal conditions within limits)

Cell Membrane

All cells are covered with a thin covering of a double layer of Phospholipids and associated Proteins

present here and there.

Each phospholipid has a polar (hydrophilic) head and non-polar (hydrophobic) tails. In the double layer

the tails face each other forming a hydrophobic barrier which keeps water dissolved contents inside.

Proteins may be Intrinsic – embedded in the lipid double layer and Extrinsic associated outside the lipid

double layer.

Cytoplasm

Cytoplasm is the living fluid part between cell membrane and nucleus. It has special structures called

Cell Organelles in it.

Cytosol is the liquid part of cytoplasm formed of water having dissolved or suspended substances in it.

Cell Organelles are organ like each performing specific function/s but formed of molecules and

membranes only (sub-cellular).

Double Membrane bound Organelles: Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body,

and Nucleus.

Single Membrane bound Organelles: Lysosomes, Peroxisomes, Vacuoles

Organelles lacking any membrane: Ribosomes, Centrioles, Nucleolus

Nucleus and Ribosomes 1

Genetic Control of the Cell

Nucleus: is the most distinct structure inside cell visible with light microscope. It has inside it DNA having

all the information needed to form and run the cell. The segments of DNA are called Genes.

Nuclear Envelope: is formed of 2 membranes with a gap between them. It has a large number of

Nuclear Pores usually bound by a nuclear complex. The pores are large enough to allow RNA and

proteins to pass through.

Nucleoplasm: is the liquid part of nucleus and has a different composition than Cytosol.

Chromatin fibers: are very long molecules of DNA associated with proteins (Histones and other nuclear

proteins). Each chromatin fiber, at the time of cell division, organizes into Chromosomes.

Nucleolus: is present in the nucleus when the cell is not dividing. No membrane bounds it. It assembles

Explanation:

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