Answer:
yo busqué todas y al parecer todas son correctas a si que.....
A cell membrane is semi-permeable. This means that it is size-specific. It allows only a particular maximum size of particles to pass through it. Large molecules such as plasma proteins and lipid molecules cannot therefore penetrate while small moecules such as glucose will easily diffuse across it.
Secondly, a cell membrane is charged. The charge is as a result of a difference in ionization between the intracellular fluid and the extracellular fluid. Substances that have the same charge as the fluid into which they are diffusing will be hard to asorb due to repulsion effect. On the other hand, substances that have opposite charge as the fluid into which they are diffusing will be absorbed easily and faster.
Finally, the cell membrane is made of two layers. Lipid layer and phospholipid layer. Inside these layers, there are embedded particles and substances such as enzymes, receptors, hormones and ion channels. During diffusion of substances across cell membrane, some substances are speeded up by these substances. For instance, Translocase enzyme in the membrane of mitochondria speeds up the transfer of Carnitine transferase into the mitochondrial matrix.
I use save my exams
https://www.savemyexams.co.uk/gcse-biology-aqa-new/
And I also use past AQA papers but end of topic tests
Hope it helps :)
Answer:
major event of anaphase is the sister chromatids moving to opposite poles of cells due to action of the condensing spindle fibres.
Explanation:
the chromatids only start separating when the pressure is sufficient to split the centromere.
Answer:
B, It helps the spine to provide structural support for the body.
- <em>If we did not have a spine, we would not function properly.</em>
- <em>Here is the spinal cord below.</em>
<em>I hope this helped at all, sorry if its incorrect.</em>
