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3 years ago

Which describes an example of genetic engineering?

Chemistry

2 answers:

Marizza181 [45]3 years ago

4 0

i think its number 3

skad [1K]3 years ago

3 0

Answer: 2)Vitamin A is added to rice to combat blindness.

Explanation:

The genetic engineering is a process of manipulation of the genome of the organism by either introducing new genes in an organism's genome or by removing the defective genes. This is basically performed to introduce new traits in an organism or to remove the disease causing genes.

Vitamin A is added to rice to combat blindness is the correct option because genetic engineering will ensure the introduction of the genes which are responsible for secretion of vitamin A in the rice plant as the rice species does not naturally produce vitamin A. This will help in combating the disorder of blindness in humans.

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In what month is the sun farthest below or south of the celestial equator?

KIM [24]

Answer: December

Explanation:

The winter solstice is around December 21, marking the date on which the Sun is lowest in the sky at noon and rises and sets farthest south.

7 0

3 years ago

Read 2 more answers

hich of the following changes always leads to an increase in the rate constant for a reaction: Decreasing the temperature Decrea

GrogVix [38]

Answer:

Only one—(i), or (ii), or (iii)—increases the reaction rate.

Explanation:

Which of the following changes always leads to an increase in the rate constant for a reaction?

Decreasing the temperature. NO. A lower temperature leads to a slower reaction because the molecules have less energy to react.
Decreasing the activation energy. YES. According to the Arrhenius equation, the lower the activation energy, the higher the rate constant.
Making the value of ΔE more negative. NO. A more negative ΔE means a reaction is more spontaneous but not faster.

4 0

3 years ago

How many moles of copper are needed to react with sulfur to produce 0.25 moles Ol

Tems11 [23]

Answer:

0.50 moles of Cu

Explanation:

The balanced chemical equation for given synthetic reaction is,

2 Cu + S → Cu₂S

According to balance chemical equation,

1 mole of Cu₂S is produced by = 2 moles of Cu

So,

0.25 moles of Cu₂S will be produced by = X moles of Cu

Solving for X,

X = 0.25 mol × 2 mol / 1 mol

X = 0.50 moles of Cu

Hence, as the molar ratio of Cu to Cu₂S is 2:1 hence, to produce 0.25 moles of Cu₂S we will need 0.50 moles of Cu.

6 0

2 years ago

Convert the composition of the following alloy from atom percent to weight percent (a) 44.9 at% of silver, (b) 46.3 at% of gold,

vesna_86 [32]

Answer:

Mass percentage of gold : 33.35%

Mass percentage of silver: 62.80%

Mass percentage of copper : 3.85%

Explanation:

$N=n\times N_A$

Where : N = Number of atoms

n = moles

$N_A=6.022\times 10^{23}$ = Avogadro number

Let the total atoms present in the alloy be 100.

Atom percentage of silver = 44.9%

Atoms of of silver = 44.9% of 100 atoms = 44.9

Atomic weight of silver = 107.87 g/mol

Mass of 44.9 silver atoms = 107.87 g/mol × 44.9 = 4,843.363 g/mol

Atom percentage of gold= 46.3%

Atoms of of gold = 46.3% of 100 atoms = 46.3

Atomic weight of gold = 196.97 g/mol

Mass of 44.9 gold atoms = 196.97 g/mol × 46.3 = 9,119.711 g/mol

Atom percentage of copper = 8.8 %

Atoms of of copper = 8.8% of 100 atoms = 8.8

Atomic weight of copper = 63.55 g/mol

Mass of 44.9 copper atoms = 63.55 g/mol × 8.8 = 559.24 g/mol

Total mass of an alloy :4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol

Mass percentage of gold :

$\frac{4,843.363 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=33.35 \%$

Mass percentage of silver:

$\frac{9,119.711 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=62.80\%$

Mass percentage of copper :

$\frac{559.24 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=3.85\%$

7 0

2 years ago

What do you think about the Civil Rights Movement?

dimaraw [331]

I don’t care about it tbh like I don’t even care about that stuff but the answer is 29272728

5 0

2 years ago