animals body are organized
Answer:
Option E
Explanation:
Complete question
A researcher is using a small molecule as an inhibitor to manipulate a signaling pathway. This inhibitor prevents phosphorylation and MOST likely targets a:
A) ligand-gated ion channel.
B) G protein-coupled receptor.
C) phosphatase.
D) G protein.
E) receptor kinase.
Solution
Receptor kinase is an enzyme that acts as a catalyst while transferring phosphate group to specific substrate thereby causing auto phosphorylation of tyrosine.
Phosphorylation occurs when receptor kinase binds to the ligands. Binding causes dimerization of receptor kinase which then phosphorylates tyrosine residues in the cytosolic domain.
The inhibitor molecule prevents phosphorylation therefore it must target the molecule responsible for causing tyrosine phosphorylation.
Hence, option E is correct
Answer:
The correct answer is D) Rate of fermentation.
Explanation:
Carbohydrates are fermented by yeast to form alcohol by alcoholic fermentation.
Now if the effects of different carbohydrate molecules are tested on yeast then the yeast will ferment different sugar molecules at different rate.
As a result the rate of fermentation will be the independent variable of the experiment.
Answer:
5.0 x CFU/mL
Explanation:
The dilution factor for a 1:1,000 dilution is .
Since 1 mL of the dilution was taken, the dilution factor that yielded the colony is /1 =
In order to find the colony forming unit (CFU) per volume (1 mL) of the original culture, divide the number of colony resulting from the plating of 1 mL of the dilution by the dilution factor. Hence;
CFU/mL of the original culture = 50/
= 5.0 x
Therefore, the concentration of the original culture is 5.0 x CFU/mL.
Answer:
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