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antoniya [11.8K]
3 years ago
13

Definition of cell wall

Biology
1 answer:
natulia [17]3 years ago
5 0

Answer:

a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants it consists mainly of cellulose.

Explanation:

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15 Activation energy is the energy that a system must have before a chemical reaction can occur.?
Bezzdna [24]

Answer:

true

Explanation:

I hope it helps

please follow me for more answers

8 0
3 years ago
Receipt of extracellular signals can change cell behavior quickly (e.g., in seconds or less) or much more slowly (e.g., in hours
balandron [24]

Answer:

A. Molecular changes such as extracellular signals on extracellular ligands can result in quick changes in cell behaviour. One example is insulin. Upon insulin binding on the receptor on the cell membrane, the cell release GLUT4 transporters (for muscle cells) to increase uptake of glucose.

B. Slow changes in cell behaviour can be observed for other lipophilic hormones or intracellular receptors such as glucocoortoid or estrogen which reacts with receptors in the cells.

C. Insulin is required to maintain a constant blood glucose level and hence levels of insulin has to be mediated in correspondence to the blood glucose levels. Fast acting signalling is thus required for homeostasis of blood glucose levels. Where for such lipophilic hormones such as steriods, glucocortoid, these hormones tend to have a longer lasting effect and hence results in a slow change.

6 0
3 years ago
Describe all the forces acting on the ice cream in the root beer float relate these forces to the fact that the ice cream is flo
Schach [20]

Answer:

The root beer exerts a force on all sides of the ice cream. These forces are all equal and cancel each other out. Gravity pushes downward on the ice cream. The ice cream floats because the buoyant force is greater than the weight of the ice cream.

Explanation:

5 0
3 years ago
Read 2 more answers
18) Which process occurs in fungi and has the opposite effect on a cell's chromosome number than does meiosis I?
grin007 [14]
That is binary fission, 'cause in this process, chromosome number doubles to it's original value whereas in meiosis it gets halved.

In short, Your Answer would be Option D

Hope this helps!
3 0
3 years ago
Heart on the run, keep your hand on a gun, cant trust anyone....<br> - Cover Me Up by Morgan Wallen
nevsk [136]

Answer:

its   "a heart on the run  keeps a hand on a gun  you can't trust anyone"

4 0
3 years ago
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