When something needs to be transported against its concentration gradient, or a molecule is too big to simply diffuse through a membrane, active transport has to be used. So active transport requires energy (ATP).
Examples:
1. Antiport pumps: transport one substance in one direction while transporting another substance the other way. An example of this is the sodium-potassium pump.
2. Symport pumps - uses a substance that wants to move from an area of high concentration to low concentration and carries another substance against its concentration gradient. An example of this is the sodium-glucose transport protein
3. Endocytosis - large amounts of extra cellular fluid can be taken into a cell - needs ATP to bind proteins in the cell membrane and causes them to change their shape...which eventually causes the surrounding of the fluid to be brought in (a vesicle).
4.exocytosis - opposite of above
Answer:
The diagram, which illustrates a form of genetic recombination, shows that each allele is granted separately to the daughter cells, which is an example of independent assortment.
Explanation:
Crossing over, fertilization and independent assortment are methods of genetic recombination. The diagram (image) states that A-a and B-b are alleles for different characteristics, found in genes and chromosomes.
Independent assortment it was observed for the first time by Gregory Mendel, during his experiments with peas, describing that alleles -the portion of genes that contains variations of specific characteristics- are unrelated to each other and can be distributed independently in the daughter cells.
In this case, thanks to independent assortment, each parent can pass the characteristics of their genotype separately to the offspring -which will have shared characteristics of both- producing genetic variation in species.
Learn more:
brainly.com/question/797676
I think the correct answer from the choices listed above is option A. The first type of cell to differentiate is a neuron. The neurons are cells that process and transmits information through electrical and chemical signals. Hope this answers the question.
