most of a atoms mass is in the nucleus of the atom:) hope this helps you
These are called Cell organelles.
Explanation:
- Cell membrane and cytoplasm are present in prokaryotes also.
- In eukaryotes specialised organelles are present that have a definite structure, definite shape and definite function.
- These organelles and their function are:
a) Endoplasmic reticulum: It form s the supporting frame work of the cell and serves as the pathway distribution of material.
b) Golgi apparatus: Synthesis and secretion of enzymes and hormones.
c) Ribosomes: Site of protein synthesis
d) Lysosomes: intracellular digestion,destruction of foreign substances,formation of bones by digesting cartilage
e) Centrosomes: Found only in animal cell Initiates and regulates cell division.
f) Plastids: present only in plands. Contain colour pigment and are responsible for carrying out photosynthesis,providing colour and storing starch.
g)Mitochondria: Known as the power house of the cell and is involved is ATP production.
h) Nucleus: Known as the brain of the cell and controls the functioning of the cell.
Composite-cone, a conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash.
Endocrinology. That would be the correct answer. {:)
Answer:
At low Ts= Hopanoids increase membrane fluidity
At higher Ts= Hopanoids reduce the membrane fluidity
Explanation:
Bacterial membranes lack cholesterol but have hopanoids. Hopanoids are synthesized from the same precursor as the steroid. The hopanoids also have five fused ring structures like that of cholesterol. The amphipathic nature of hopanoids allows them to maintain the membrane fluidity under low and higher temperature conditions.
When the temperatures are higher, the hopanoids serve to reduce the membrane fluidity by their ability to interact with polar heads and non-polar tails of the membrane phospholipids. At lower temperatures, hopanoids insert themselves between the non-polar tails of phospholipids to increase the membrane fluidity.