B. by decreasing the pressure of a chemical reaction
C. by increasing the concentration of reactants in a reaction
D. by decreasing the activation energy of a reaction
Answer: D) By decreasing the activation energy of a reaction
A catalyst is a substance that speed up the rate of chemical reaction without affecting the product of the reaction. They only affect the rate of reaction not the yield of reaction.
Catalyst provide an alternative reaction pathway that has lower activation energy than that of uncatalysed reaction. It increases the frequency of collision and because of these greater collision which lowers the activation energy of the reaction.
A catalyst works by decreasing the activation energy of a reaction, providing an alternative pathway for the reaction to occur with lower energy barriers. Therefore, the correct answer is option is d.
A catalyst works by D. by decreasing the activation energy of a reaction.
A catalyst is a substance that speeds up a chemical reaction without itself being consumed or permanently changed in the process. It achieves this by providing an alternative reaction pathway with a lower activation energy. The activation energy is the minimum amount of energy required for a reaction to occur.
Here's how it works:
In a chemical reaction, reactant molecules need to overcome an energy barrier, represented by the activation energy, to transform into products.
Catalysts provide an alternative route for the reaction that has a lower activation energy. This lower activation energy pathway is often referred to as the catalyzed pathway.
By reducing the activation energy, the catalyst allows more reactant molecules to possess the required energy to overcome the barrier and react, thus increasing the reaction rate.
Importantly, the catalyst itself remains unchanged at the end of the reaction and can be used repeatedly for other reactions.
In summary, a catalyst facilitates a chemical reaction by lowering the activation energy required for the reaction to proceed, making it easier for reactant molecules to convert into products and increasing the reaction rate.
Therefore, the correct answer is option is d.
Learn more about How a catalyst works here:
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Assuming a diallelic gene exhibiting complete dominance, with tall plants being the dominant phenotype and short plants the recessive one, the cross of a heter0zyg0us plant with a short one results in a phenotypic ratio 1:1.
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We know that the cross involved a heter0zyg0us dominant tall pea plant and a short pea plant.
We will assume a diallelic gene coding for this trait, and exhibiting complete dominance. This means that the dominant allele completely masks the expression of the recessive allele.
So,
If the heter0zyg0us plant exhibits the dominant phenotype, it means that the allele coding for tall plants in the dominant allele.
So let us say that
According to this information, the tall plant is Tt and the short plant is tt.
So let us make the cross,
Cross: tall plant with short plant
Parentals) Tt x tt
Gametes) T t t t
Punnett square) T t
t Tt tt
t Tt tt
F1) Genotype
Genotypic ratio ⇒ 1:1
Phenotype
Phenotypic ratio ⇒ 1:1
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Golgi bodies
ribosomes
Answer;
-Mitochondria
Explanation;
-Cellular respiration is the process by which cells breakdown organic molecules such as glucose to yield energy in the form of ATP, which is used by the cells to drive cellular processes such as transport, growth and excretion among others.
-The process mainly occurs in the mitochondria of a cell. The mitochondria therefore acts as a power house of the cell. Cellular respiration involves three stages or phases(if aerobic), glycolysis, citric acid cycle and electron transport chain.
Answer:
Explanation:
the relations of these three
Protoplasm refers to the living contents of cell and consists of cytoplasm and a nucleus. Cytoplasm refer to the matrix present outside the nucleus in which all the cell organelles are found embedded. The nucleoplasm/karyoplasm refer to the matrix present inside the nucleus only.