Answer:
B.) Active transport uses ATP and moves substances against the concentration gradient; facilitated diffusion does not.
Answer:
64
Explanation:
One codon has three nucleotides. There are four types of nucleotides present in mRNA. These nucleotides differ from each other with respect to the nitrogenous base present in them. These bases present in the mRNA are uracil, guanine, cytosine, and adenine. Therefore, each codon of a triplet code can be replaced with three other nucleotides to produce a different codon. This means that a triplet can have four different bases for each of its three nucleotides. In this way, there are total of 4^3= 64 unique codons.
The correct answer is option A
The major advantage of DDT at that time when it was used as a pesticide is that the DDT was very effective as a pesticide and it killed almost all the pests on which it was sprayed. It killed all the insect and pests that was present in the united states at that time. It later became harmful and entered into the food web.
Answer: Down a Concentration Gradient refers to going from regions of high concentration of some entity to regions of low concentration, and such movement generally occurs spontaneously, that is, if allowed to happen it happens. ... Concentration gradients can be either gradual or instead abrupt.
Explanation:
Answer:
cell wall
Explanation:
the cell wall helps fighting any bacteria that tries to infect the cell itself.