Top answers

Could you explain the difference between passive diffusion and facilitated transport?

Passive diffusion occurs without any transmembrane proteins being involved, the molecules cross the lipid bilayer following a concentration gradient (from the highest concentration to the lowest). Small unch...
EW
Answered by Eleonore W. • Biology tutor
3829 Views

How can I improve my "chain of reasoning" when explaining answers so I can achieve full marks for analysis (KAA)?

Producing a "chain of reasoning" in your answers is one of the more difficult requirements of the A level Economics syllabus. It is important when explaining your answers that you make clear and lo...
TW
Answered by Tom W. • Economics tutor
7673 Views

Define relative formula mass (Mr) and calculate the relative formula mass of CaCO3. (Ar: Calcium= 40; Oxygen= 16; Carbon= 12)

The relative formula mass (Mr) of a compound is the sum of the relative atomic masses of the atoms in the numbers shown in the formula. Relative formula mass (Mr) of CaCO3 = 40+12+(3x16)=100.
CM
86057 Views

How does the body regulate heat?

Body temperature is regulated by a thermoregulatory centre in the brain, the hypothalamus. The hypothalamus can sense the temperature of the blood via receptors. The skin also contains temperature receptors ...
NC
Answered by Natasha C. • Biology tutor
3083 Views

Solve 4x^2 - 3x - 4 = 0

There are two different methods of solving this equation and it is important to find the method that you find easiest. The first method is to split up the numbers and the letters on both sides of the equatio...
OH
Answered by Oliver H. • Maths tutor
5485 Views