Answer:
B (active transport using ATP)
Explanation:
Movement of substances normally occur in the direction of concentration gradient/difference i.e. the difference in concentration of a substance across a membrane. Letting molecules diffuse or pass down their concentration gradient does not require energy but pumping those molecules against gradient requires energy in form of Adenosine triphosphate (ATP). This process is called Active transport.
In order to perform certain cellular processes, cells need to move substances from their surroundings into the cell across their cell membrane. Moving this substances against the concentration gradient between the cell membrane and its extracellular fluid requires energy (ATP).
An example is the sodium-pottasium pump employed by animal cells in which they expend energy to move K+ molecules into the cell and Na+ molecules outside the cell against the concentration gradient of their cell membrane and extracellular solution.
Answer:
They were not around at that time or either from it being so hot they just disappeared/melted.
Explanation:
Tryptophan is specified by one single codon, which is what makes it so unique since it’s the only amnio acid that has one codon.
<span>Tsetse flies feed by piercing the skin with their mouthparts and: Sucking the blood of animals and humans. </span>
Answer:
a
Explanation:
photolysis means splitting of light for that it is important
