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jolli1 [7]
2 years ago
8

The controls the materials that enter and leave the cell.

Biology
1 answer:
zysi [14]2 years ago
5 0
Cell membrane is the answe
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T is for textured
Mademuasel [1]
75% do a punnet square if you don’t understand
8 0
3 years ago
Read 2 more answers
Assume that you have 1 mL of a solution of amylase (an enzyme) at a concentration of 15 mg protein/mL. Calculate the volume of d
lidiya [134]

Answer:

42,5 mL

Explanation:

We need to use the serial dilution formula beacuse we start with a stock concentrate solution and we need to prepare a new less concentrated one.

DF=\frac{Vi}{Vf}

<u>DF in the dilution factor, Vi is the initial volume and Vf is the final volume.</u>

The first step is to have the same measurment unit so we need to convert 345 µg to mg.

we know that 1 µg equals 0,001 g, hence:

345 µg = 0,345 mg

now the final volume is 0,345 mg  protein/ mL and the inital volume is 15mg protein/mL, both of them are in the same unit so we can use the formula

DF= \frac{15mg protein/mL}{0.345mg protein/mL}

DF= 43,5 mg protein/ mL

Now since the question said that we already have 1.0mL of the amylase stock solution we need to subtract that 1.0mL to the 43,5 mg protein/mL

43,5mL-1,0mL = 42,5 mL

So, we need 42,5 mL of diluting buffer if we want a final concentration of 345 µg protein/mL (0.345 mg protein/mL)

8 0
3 years ago
Which topic related to the photograph would most likely be studied by a biologist?
sammy [17]
The reproductive habits of ducks, hope its helpful

4 0
3 years ago
Where exactly on the map does the size and concentration of the boxes appear to be the highest?
pav-90 [236]

The concentration and size of boxes the same at all locations is not the same size. The deaths due to cholera vary depending upon the location. The relative sizes represents that died at that certain spot.

Explanation:

The black boxes represent relative numbers of death due to cholera. Cholera is referred to as a disease of poverty because of the lack of social development in the areas in which it occurs. Crowded camps are fertile ground for a cholera outbreak. Other humanitarian crises including flooding and earthquakes, civil unrest or war that causes disruption of water and sanitation systems.

4 0
2 years ago
Humans are different from each other in many ways, including in their sizes, shapes, skin color, facial features, and handedness
strojnjashka [21]

Answer:

<em>The correct option is C) Humans from different locations can donate blood and organs to one another.</em>

Explanation:

Organisms belonging to the same species can interbreed and produce fertile offsprings. As humans all around the world can interbreed and produce fertile embryo hence all human beings belong to the same species. Also, the organs and blood of organisms from the same species can be transferred depending on the compatibility. It is less likely for the human body to reject a graft from other human being rather than another species. Although, xenotransplantation has been practiced in the laboratory by scientists but it has not produced any good results.

4 0
3 years ago
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