Answer:
The correct answer is Active transport moves substances against the concentration gradient.
Explanation:
The principle difference between active transport and facilitated diffusion is that active transport helps in the movement of various substances in the uphill direction which means against the concentration gradient.
In simple words active transport helps in the movement of substance from the region of low concentration to a region of high concentration.
On the other hand during facilitated diffusion substances move along their concentration gradient which means from the high concentration region to the region of low concentration until the concentration of both sides become same.
<u>Answer</u>:- The three forms of nitrogen in an aquarium are
1. Nitrate NO3-
2Nitrite NO2-
3. Ammonia NH3
<u>Explanation</u>:
- The waste products produced by fishes is broken down into ammonia which is highly toxic for the fishes present in the aquarium.
- The nitrogen cycle takes place in the aquarium to convert this toxic <em>ammonia</em> into lesser toxic forms.
- This nitrogen cycle proceeds to convert ammonia into <em>nitrite</em> and then nitrite into <em>nitrate</em>. This means the cycle is ammonia——>nitrite——> nitrate.
- This conversion takes place with the help of several bacteria which establish a colony in the filter bed of the aquarium in the presence of ammonia .Then these bacteria help to finally convert ammonia to nitirite and then to nitrate.
- The bacteria that convert ammonia to nitrite are oxygen loving bacteria called as <em>Nitrosomonas</em>. The nitrite so formed is less toxic as compared to ammonia.
- The conversion of nitrite to nitrate takes place by the bacterial species called as <em>Nitrobacter</em> . The nitrate thus formed is harmless for the aquarium fishes at low levels.
Thus, in this nitrogen cycle we can see that<em> there are three different forms in which nitrogen is present- ammonia, nitrate and nitrite.</em>
Answer:
•according to the codons of mRNA
•tRNA molecules with complementary unticodon
•bring the required amino acids to the ribosome
•the the acids link together by peptide bonds
Sickle cell disease trait is passed on when one parent has a change in the a gene. when no the parents have a Chan g rd in the a gene then the chances of getting sickle cell disease is greater