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3 years ago

Identify the role of the nucleus in a cell

Chemistry

2 answers:

vaieri [72.5K]3 years ago

8 0

Answer:

the nucleus main function is to enclose the DNA and keep it seperate from the cytoplasm. It also plays a very important part in semi conservative DNA replication, and also transcription during protein synthesis.

Explanation:

notka56 [123]3 years ago

3 0

Answer:

The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle.

Explanation:

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Teeth to Bachile can be see more than once

blsea [12.9K]

Huh I don’t understand

7 0

3 years ago

Calculate the analytical and equilibrium molar concentrations of the solute species in an aqueous solution containing 155 mg of

Cloud [144]

Answer:

The analytical molar concentration is 0,04743M

The equilibrium concentrations are HA = 0,01281M; H⁺ and A⁻ = 0,03462M

Explanation:

The analytical molar concentrations is:

155mg ≡ 0,155g÷163,4g/mol = 9,486x10⁻⁴ moles

9,486x10⁻⁴ moles ÷ 0,020L = 0,04743 M

The trichloroacetic acid [HA] dissociates in water in a 73%, thus:

HA ⇄ H⁺ + A⁻

The equilibrium concentrations are:

HA = 0,04743M ×(100-73)% = 0,01281M

H⁺ and A⁻ = 0,04743M ×73% = 0,03462M

I hope it helps!

8 0

4 years ago

Is it possible for the properties of a substance with a specific type of bond to vary from what was observed in this virtual lab

Anton [14]

Water has a specific type of bonds but has change the temperature its density will vary somewhat. properties such as appearance and solubility, and melting point.

6 0

3 years ago

A scientist discovers a new type of polymer. What must be true about this polymer?

DochEvi [55]

The correct answer is D

a polymer is a substance made up of large molecules with repeating sub units called monomers.

A is incorrect because its a ring structure which means it cannot form the long chain that is exhibited by polymers.

B is incorrect because the double bonds will cause saturation, hence no monomer can bond to another monomer to form the large molecule.

C is incorrect because the large molecule has repeating sub-units hence only specific types of molecules can be present, and it is usually carbon and hydrogen.

3 0

3 years ago

g Which ONE of the following molecules and ions has trigonal planar molecular geometry? (NOTE: You must first determine what the

Dmitrij [34]

Answer: C) $CO^{2-}_{3}$

Explanation: The Valence Shell Electron Pair Repulsion Model (VSEPR Model) shows bonding and nonbonding electron pairs present in the valence, outermost, shell of an atom connecting to other atoms. It also gives the molecular geometric shape of a molecule.

To determine molecular geometry:

1) Draw Lewis Structure, i.e., a simplified representation of the valence shell electrons;

2) Count the number of electron pairs (count multiple bonds as 1 pair);

3) Arrange electron pairs to minimise repulsion;

4) Position the atoms to minimise the lone pair;

5) Name the molecular geometry from the atom position;

Trigonal planar molecular geometry is a model which molecule's shape is triangular and in one plane. Such molecule has three regions of electron density extending out from the central atom and the repulsion will be at minimum when angle between any two is 120°.

The Lewis structure of each molecule is shown in the attachment.

Analysing each one, it can be concluded that molecule with trigonal planar geometry is $CO^{2-}_{3}$

8 0

3 years ago