Around 10^21 per second, when the amount made per day is the average, 75kg.
200
Avagadro's number is the amount of molecules in a mole. This is 6.022x10^23 molecules. There will be 6.022x10^20 molecules in a millimole and 6.022x10^14 in a nanomole. Therefore, the difference between these is how many molecules there are in the difference. This gives you approx 6.021994x10^20 molecules. This is limited by the amount of significant figures for avagadros number that I know of.
1.34x10^23
Four
100
Penis!
A brain cell is made of many molecules.
It has 2 ATP molecules.
No. A cell consists of many, many molecules - millions probably.
Cell membrane is selectively permeable membrane, therefore it allows selective molecules to be taken in by the cell and excludes others. Whereas cell wall is permeable in nature and does not inhibit the intake of many molecules what the cell membrane does.
1000
120
A single enzyme molecule can act on about 1000 substrate molecules per second.
23 Chromosomes
. . . . . .
Each RBC can carry up to 4 oxygen molecules.
The cell wall. This structure is made up of a phospholipid bilayer and is studded with transport proteins that help pump molecules in and out of the cell. Many molecules are small enough to pass through the cell wall unaided by these proteins.