cells

how to find out plasmid size

A researcher is given the task of designing a protein that will bind to a receptor very well. The receptor's binding site has strong positive charges at the edges and negative charges in the center. How would you go about designing the protein to bind to it?

movement in and out in the celll

A-level bio Q. How does ions cross the phospholipid bilayer? can very small ions just diffuse across?

Animal cells, including those of humans, are eukaryotic cells. Explain the link between mitochondria in muscle cells and rough endoplasmic reticulum in enzyme secreting cells from salivary glands. The cells in tadpole tails are specialised and contain many more lysosomes compared to its other cells. Describe he production of lysosomes and suggest how this adaptation allows a tadople's tail to be absorbed as it changes into a frog. Animals tend to be multicellular organisms. Give the levels of organisation responsible for creating organisms.

what would the gradient show?

Really need help asap

I need to do a poster on Sickle Cell Anaemia. What can I do to make it interestin nd lively? Any ideas?

Why do phospholipids form bi-layers and triglycerides form droplets??

Name the amino acid carrier in a cell?

What is the definition of osmosis

It comprises of phosolipids right? The phosphorus is hydrophilic, and the fatty acids hydrophobic. I asked my teacher how the water diffused in and out of the membrane then, and she said. "The water molecules are small enough that they just go through"

Now. I know I'm the student, but that doesn't fit with me? Then I learnt about the transport protiens. And that made more sense.

But, is that the defenite way, and if so, what really happens in the process of water going in and out of the membrane?

During meiosis 🙂

when the 2nd tRNA is formed between 2 amino acids what bond is this called?

Why do muscle cells have a high amount of mitochondria?

I approach this by thinking of a cell as my entire body. If I lie in bed and do nothing all day I am like a fat cell. I only need a little energy which I get from a small amount of food in the way that fat cells only a little energy which they get from a small number of mitochondria. On active days I am like a muscle cell. I need lots of food in the way that fat cells need a lot of mitochondria to give them energy. Mitochondria are the energy factories for all cells. ATP synthesis occurs in them by ADP and Pyruvate synthesizing to create ATP, which is energy. Muscle cells work hard to move and contract and this is why they require a lot of energy thus they contain more mitochondria to produce a high level of ATP

Why do heart cells have a high amount of mitochondria?

Mitochondria are the organelles in the cell that produce energy in the form of ATP. When cells complete the process of cellular respiration they produce oxygen, glucose (C6H12O6), and this form of energy. The heart muscle is truly amazing in that it is constantly contracting and relaxing, and never tires. Mitochondria are the means of providing energy for this constant activity, and a lot are needed for this. As the heart is constantly pumping blood around the body, it needs a rich supply of oxygen and glucose. There are more mitochondria found in heart cells because this means we are able to produce enough energy to keep it functioning efficiently. This is a trait we humans have evolved in order to increase our chances of survival.