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Ira Lisetskai [31]
3 years ago
9

Which of the following is a key a function of the glial cells?

Biology
1 answer:
Evgen [1.6K]3 years ago
3 0
They are thus known as the "supporting cells" of the nervous system. The four main functions of glial cells are: to surround neurons and hold them in place, to supply nutrients and oxygen to neurons, to insulate one neuron from another, and to destroy and remove the carcasses of dead neurons (clean up).
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What type of epithelial cell are taller than they are wide? ​
Dennis_Churaev [7]

Answer:

Columnar epithelium

Explanation:

Squamous epithelium has cells that are wider than they are tall. Cuboidal epithelium has cells whose height and width are approximately the same. Columnar epithelium has cells taller than they are wide.

4 0
3 years ago
What are foreshocks and aftershocks? *
Pavlova-9 [17]

Answer:

Explanation:

Aftershocks are earthquakes that follow the largest shock of an earthquake sequence. They are smaller than the mainshock and within 1-2 fault lengths distance from the mainshock fault.

Foreshocks are relatively smaller earthquakes that precede the largest earthquake in a series, which is termed the mainshock.

5 0
3 years ago
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Which of the following science related statements are observations rather than opinions? Select all that apply.
Nastasia [14]

Answer:

C and D

Ocean acidity was greater in 2010 than in 2000.

Heart disease is the major cause of death in the United States.

Explanation:

just took the question and those are the only two that are correct.

3 0
3 years ago
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How much coal will be produced in the year 2020 for EACH region
earnstyle [38]

Until now it is estimated U.S. coal production totaled about 9.1 million short tons (MMst) 27%lower than last year.

East of mississippi river totaled 3.7 MMst

West of mississippi river totaled 5.4 MMst

The supply of both types of coal is expected to decline as production from Appalachia falls from 201.5 million tons in 2018 to 170.1 million tons in 2020.

5 0
2 years ago
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The Km of your favorite enzyme that operates by normal Michaelis-Menten kinetics is 10-6 M. You start off with a substrate conce
swat32

Answer: (a) 0 no free enzyme left

(b) 10^-9M

Explanation:

ANSWER:

Given that

Kcat = 10 sec-1

Km = 10^-6 M

[S] = 10^-3 M

[Enzyme] = 10^-9 M

The reaction follows the following path-

Enzyme (E) + Substrate (S) <=> ES complex -> E + Product (P)

According to the improved model of Michaelis-Menten kinetics, upon addition of substrate and the enzyme, instead of dynamic equilibrium, a steady state is reached. The time taken is very less, almost instantaneously (since Kcat is much higher than the concentrations we are dealing with (10 per second! Whereas we are dealing with concentrations as low as 10-9).

In this steady state, the Enzyme and substrate instead of existing individually, exist as an Enzyme-Substrate complex, or ES complex.

Physically, Km is a measure of how well substrate complexes with an enzyme, i.e. It's binding affinity.

You can imagine this as if 1 unit of the substrate can bind to "Km" units of Enzyme. For the give conditions, 1 M of the substrate requires 10^-6 M enzyme for complete binding. So, 10^-3 M of the substrate will require 10^-3 x 10^-6 = 10^-9 M of the enzyme, which is the exact amount of enzyme added to the reaction mixture.

So it is safe to assume that when the steady state is reached, all of the enzyme is bound to the available substrate producing the ES complex with the concentration equal to the limiting reactant, i.e. the enzyme = 10^-9 M

Hence, there will be no free enzyme left after the short duration of the reaction. And the concentration of the ES complex will be 10^-9 M

8 0
3 years ago
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