Answer:
Selective permeability is a property of cellular membranes that only allows certain molecules to enter or exit the cell. ... Movement across a selectively permeable membrane can occur actively or passively. For example, water molecules can move passively through small pores on the membrane.
Explanation:
Answer:
Tetracycline was discovered in the 1940s and is effective against both gram-positive and gram-negative bacteria. Tetracycline is an antibiotic which kills the bacteria by inhibiting the synthesis of protein.
Tetracycline act by inhibiting the process of translation by preventing the binding of aminoacyl-charged tRNA to the A site of the ribosome.
Since the aminoacyl charged tRNA does not bind the A site therefore the process of translation is inhibited.
La biogénesis es el proceso fundamental de los seres vivos que producen otros seres vivos. Ejemplo: una araña pone huevos de los que saldrán más arañas. La biogénesis es aquel principio según el cual la vida solamente se origina de una vida preexistente (que ha existido antes).
Answer:
It is a replacement that has an important effect on protein function because Arg and Gln are residues with different chemical properties.
Explanation:
In this case, Arginine (Arg) is a basic and positively charged residue, while Glutamine (Gln) is an uncharged (neutral) amino acid. Non-conservative substitutions like that are generally expected to have deleterious effects and they are generally removed by natural selection. Moreover, Arg is also a target for phosphorylation, which is the most important posttranslational modification. Phosphorylation is known to be capable of causing the activation of different proteins, especially kinases, and, therefore, the mutation at Arg109 might also inactivate the active site of this protein.
