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motikmotik
3 years ago
7

The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the e

nzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n):
Chemistry
1 answer:
san4es73 [151]3 years ago
4 0

Answer:

an inducer

Explanation:

An Enzyme is a protein molecule found in cells which work as biological catalysts.

They speed up chemical reactions in the body, but do not get used up in the process, and can be used over and over again.

In chemistry inducers are molecules that regulates gene expression, and can bind to protein repressors or activators.

Lactose here acts as an inducer because it inactivates the repressor of an operon.

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What is the molality of nitric acid in a concentrated solution of nitric acid (68.0% HNO3 by mass)? (a) Outline the steps necess
RoseWind [281]

Answer:

33.8 m

Explanation:

(a) We want to know the molality of nitric acid in a concentrated solution of nitric acid (68.0% HNO₃ by mass).

Step 1: Determine the mass of HNO₃ and water in 100 grams of solution.

Step 2: Convert the mass of HNO₃ to moles.

Step 3: Convert the mass of water to kilograms.

Step 4: Calculate the molality.

(b)

Step 1

In 100 g of solution, there are 68.0 g of HNO₃ and 100 g - 68.0 g = 32.0 g of water.

Step 2

The molar mass of HNO₃ is 63.01 g/mol. The moles corresponding to 68.0 g are:

68.0 g × (1 mol/63.01 g) = 1.08 mol

Step 3

The mass of water is 32.0 g = 0.0320 kg

Step 4

The molality of HNO₃ is:

m = moles of solute / kilograms of solvent

m = 1.08 mol / 0.0320 kg

m = 33.8 m

5 0
3 years ago
Read 2 more answers
How many grams of lithium nitride needs to react with excess water at stp to produce 15.0 l of ammonia
anzhelika [568]

Answer:

Mass = 24.4 g

Explanation:

Given data:

Mass of lithium nitride needed = ?

Volume of ammonia = 15.0 L

Solution:

Chemical equation:

Li₃N + 3H₂O   → NH₃ + 3LiOH

One mole = 22.414 L

We will compare the volume of lithium  nitride and ammonia.

                                NH₃             :            Li₃N

                              22.414           :              22.414

                               15.0              :               15.0  

Number of moles of lithium nitride:

PV = nRT

n = 1 atm ×15 L / 0.0821 atm.L / mol.K × 273 K

n = 15 /22.41 /mol

n =0.7

Mass of Lithium nitride:

Mass = number of moles × molar mass

Mass = 0.7 mol × 34.83 g/mol

Mass = 24.4 g

5 0
3 years ago
NO2 + H20-------> HNO2+ HNO3​
Luden [163]

Answer:

6NO2+3H2O-------->3HNO2+3HNO3

8 0
2 years ago
What type of compound is B4F10, and what is its name?​
Gemiola [76]

A binary compound is a compound formed from two different elements. There may or may not be more than one of each element. A diatomic compound (or diatomic molecule) contains two atoms, which may or may not be the same.

...

Nomenclature of Ionic and Covalent Compounds.

4 0
2 years ago
Which type of reaction is described by the following equation? Na2O (s) + 2CO2 (g) + H2O (g) produces 2NaHCO3 (s)
TiliK225 [7]

Answer:

If the reaction is going from left to right it would be synthesis, if going right to left it would be decomposition.

Explanation:

Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)

Left Side

Na = 2

O = 6

C = 2

H = 2

Right Side

Na = 2

O = 6

C = 2

H = 2

Ok so is balanced already, though initial equation in question had an error in regards to the left hand side the ) should have been an O.

Hmm

Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)

If it was going from right to left would be decomposition

But going from left to right it would be synthesis

8 0
3 years ago
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