Answer:
i answered already, but i can again the correct answer is d
Explanation:
Answer:
Thigmotropism is a plant's response to touch.
Thigmotropism is a plant's response to an external stimulus.
Thigmotropism can occur quickly or slowly.
Thigmotropism may involve the way in which a plant grows.
Thigmotropism may involve the closing and opening of plant leaves.
Answer:
Negative
Explanation:
There are more electrons (negative charge) than there are protons (positive charge).
<h2>b) option is correct </h2>
Explanation:
- Some bacterial toxins cause disease by altering the activity of G protein, cholera toxin is one of them
- Cholera toxin catalyse ADP ribosylation of Gs and blocks GTPase activity thus Gs GTP become permanently active
- Constitutive activation of Gs protein continuously induce adenylyl cyclase, cytosolic cAMP level rises that leads to activation of protein kinase A (pKA)
- Activated pKA catalyse phosphorylation of two transmembrane proteins of intestinal epithelial cells:
- CFTR cause excessive outflow of Cl- ion and Na+ H+ exchange cause efflux of Na+ ion, both enters in gut and form Na+ Cl-
- Na+Cl- leads to outflow of water from the gut, resulting in diarrhea and dehydration and this condition may cause death of organisms due to loss of water and ions
