it's the ribosomes
Organelles
The cytoskeleton acts as a "track" on which cells can move organelles, chromosomes and other things.
When a receptor protein acts as an enzyme, the receptor protein activates a second messenger that acts as a signal molecule within the cell. Resources: HOLT Biology Textbook - 9th grade edition Chapter 4, Cells and Their Environment.
The cell membrane acts like the skin on your body because it coats the outside of the cell and protects the organelles.
its the nucleus
Nucleoplasm was discovered in and orchid cell, in 1831 by Robert Brown. Nucleoplasm is the fluid usually found in the nucleus of eukaryotic cells. The nucleoplasm acts as a suspension medium for the organelles of the nucleus.
A. Redgrave has written: 'Factories Acts'
Insulin
Mitochondria are organelles in the cytoplasm of cells that function in energy production.
Mitochondria
First of all 'catalist ' is spelled as 'CATALYST'. Note the 'Y' in place of 'i'. A protein that acts as an orgsanic catalyst is an ENZYME.
1) Acts as catalysts for most biochemical reactions 2) Acts as a carrier for amino acids during protein synthesis 3) Acts as a transmitter of genetic information to offspring 4) Acts as a template in protein synthesis.