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Murljashka [212]
3 years ago
13

Which is the jellylike substance within cells? plasma membrane DNA cytoplasm ribosomes

Chemistry
2 answers:
prisoha [69]3 years ago
7 0

Answer:

Cytoplasm is the semi fluid gel like substance of a cell that is present within the cellular membranes and surrounds the nucleus.

Explanation:

Hope this helps :)

sdas [7]3 years ago
7 0

Answer:

cytoplasm is correct

Explanation:

i took the test

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If 0.896 g of a gas occupies a 250 mL flask at 20°C and 760 mm Hg of pressure, what is the molar mass of the gas?​
salantis [7]

Answer:

86.2 g/mol

Explanation:

Before you can find the molar mass, you first need to calculate the number of moles of the gas. To find this value, you need to use the Ideal Gas Law:

PV = nRT

In this equation,

-----> P = pressure (mmHg)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas constant (62.36 L*mmHg/mol*K)

-----> T = temperature (K)

After you convert the volume from mL to L and the temperature from Celsius to Kelvin, you can use the equation to find the moles.

P = 760 mmHg                                      R = 62.36 L*mmHg/mol*K

V = 250 mL / 1,000 = 0.250 L              T = 20 °C + 273.15 = 293.15 K

n = ? moles

PV = nRT

(760 mmHg)(0.250 L) = n(62.36 L*mmHg/mol*K)(293.15 K)

190 = n(18280.834)

0.0104 = n

The molar mass represents the mass (g) of the gas per every 1 mole. Since you have been given a mass and mole value, you can set up a proportion to determine the molar mass.

\frac{?grams}{1 mole} =\frac{0.896grams}{0.0104moles}                                      <----- Proportion

?grams(0.0104moles) = 0.896                       <----- Cross-multiply

?grams = 86.2                                               <----- Divide both sides by 0.0104

8 0
2 years ago
Calculate the number of different atoms in 0.2 mol ethene​
muminat

Answer:

1.204 × 10²³

Explanation:

The number of atoms in a mole is always 6.022 × 10²³, known as Avogadro's number or Avogadro's constant.

To convert moles to atoms, multiply the molar amount by Avogadro's number.

(6.022 × 10²³) × 0.2

         = 1.204 × 10²³

4 0
3 years ago
If the pOH of a solution is 9.1, what is the concentration of OH- ions in that solution?
Amiraneli [1.4K]

Answer:

7.9432*10^-10 or 10^-9.1

Explanation:

pOH=-log[OH]

4 0
3 years ago
An action potential causes calcium ions to diffuse from the ________ into the ________.
Rzqust [24]

Answer:

sarcoplasmic reticulum; sarcoplasm

Explanation:

The sarcoplasmic reticulum (RS). This is a membrane complex similar to the endoplasmic reticulum in other cells, but in the skeletal muscle it forms a tubular network around each myofibril. On each side of the T-tubule the sarcoplasmic reticulum widens and forms a chamber called a terminal cistern, which joins the T-tubule through a structure known as 'foot'. The combination of a pair of terminal cisterns and the transverse tubule is called a 'triad' and although their membranes are joined, the liquid contents are separated and different.

The intracellular concentration of calcium ions (Ca2 +) remains low due to 'pumps', which take them out when their concentration increases. Although skeletal muscle fibers 'pump' Ca2 + out of the cell, they also remove calcium from the sarcoplasm by transporting it to the terminal cistern of the sarcoplasmic reticulum. The sarcoplasm of a resting muscle fiber contains concentrations of Ca2 + around 10-7 molar / liter and its concentration within the terminal cistern can be up to 1000 times higher; In addition, the cistern contains a protein called calsecuestrin, which binds calcium ions reversibly. Including both free calcium and calcium bound to other molecules, the total concentration of Ca2 + inside the cistern can be up to 40,000 times that inside the surrounding sarcoplasm.

For the interaction between actin and myosin to produce the contraction to occur, there must be calcium, which after the contraction must be removed and the delivery and elimination of this ion is carried out by the combined work of the tubular-T system and the RS. The RS surrounds the myofibrils as a system of networks, one of them around the A-band and the other in the I-band, and where the two networks meet, at the junction of the A-and -I bands, the RS It forms a cistern. The RS controls the level of intracellular Ca2 + in the skeletal muscle, storing and releasing it. Initially the sarcoplasmic reticulum develops as an ER, but as the muscle differs it is enriched with specific proteins. Three proteins initially purified from the sarcoplasmic reticulum are, calcium ATPase (SERCA), calsecuestrin (CLQ) and ryanodine receptor (RyR). SERCA is responsible for pumping calcium into the RS light during relaxation, while CLQ is the most prominent of the calcium chelating intraluminal proteins and between them increases the capacity of the RS for calcium. The most abundant SR protein outside the tubule-T-RS junction is SERCA, which is normally distributed in tubular elements surrounding the Z-and -M lines, as well as in the elements aligned with the longitudinal axis of the myofibril. In the light of RS the most abundant protein is CLQ, an acidic protein that binds calcium with moderate affinity and high capacity.

6 0
4 years ago
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the sol
Gekata [30.6K]

Answer:

0.917

Explanation:

3 0
3 years ago
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