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Chemical reactions require energy to begin. The reactants must collide with enough energy for bonds to change. This energy is known as activation energy - the difference in energy between that of the reactants and the amount needed for the reaction to occur.
Catalysts lower the activation energy needed for a chemical reaction to occur, therefore also increasing the rate of a reaction. Enzymes are proteins which act as catalysts within cells.
Therefore, enzymes cause the activation energy to lower.
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Answer:
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Explanation:
Answer: the name used is polytene chromosomes.
Explanation:
Polytene chromosomes are produced when repeated rounds of deoxyribonucleic acid (DNA) replication without cell division forms a giant chromosome, they have thousand of DNA strands and provides high level of function in the salivary glands.
At interphase, polytene chromosomes are seen to have distinct thick and thin banding patterns, these bands are of 2 types, the dark band (dark stained,
contains more DNA and less RNA) and the interband (light stained, more RNA and less DNA). The bands enlarge and forms a swelling called puff in certain times, the puffing (which is the formation of puff) is caused by the uncoiling of individual chromomeres in a band. The puffs indicate the site of active genes where mRNA synthesis takes place. These distinct banding patterns are used to study the function of genes in transcription because they permit high level of gene expression.
Marla has four cards labeled Q, R, X, and Z to represent four different elements: nitrogen, calcium, germanium, and bromine, and Q and Z are both nonmetals. Option C is correct regarding the elements.
<h3>What is the atomic constitution?</h3>
The atom contains electrons, protons, and neutrons, and the electrons revolve outside on their orbits while the proton and neutron are present in the center. The proton and electron numbers are the same in the neutral atom, so from the proton number, the atomic number of the element can be determined. Here, Q (nitrogen) and Z (bromine) are nonmetals, the R (calcium) is a metal, and the X (germanium) is a metalloid.
Hence, Option C is correct regarding the elements, as Q and Z are both nonmetals.
Learn more about the atomic constitution here.
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