Answer:
DNA ligase
Explanation:
<em>The biochemist must have left out DNA ligase enzyme.</em>
<u>The DNA ligase enzyme is able to catalyze the formation of phosphodiester bonds and as such, capable of joining strands of DNA together to form a single strand.</u>
The numerous DNA segments of a few nucleotides long observed by the biochemist must have been the replicated product of the lagging DNA strand. The lagging strand is replicated discontinuously in short strands because the DNA polymerase enzyme can only elongate primers in 5' to 3' direction. The short segments are known as Okazaki segments and are usually joined together to form a whole strand by the DNA ligase enzyme.
Hence, the missing component is the DNA ligase.
<u>Answer:</u>
<em>It is not true to say that common ancestors occurs only within a single species rather two species with similar traits might have a common ancestor. </em>
<u>Explanation:</u>
If the ancestor is same for both the species then it is said that both the species are closely related and share common ancestor with similar evolutionary relationship.
Phylogenetic tree are drawn and studies are done to understand the ancestor of a species. The evolution has occurred from the ancestor to the new species formed.
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Answer:
<u><em>C. bacteria genetically modified to be antibiotic-resistant</em></u>
Explanation:
<em>Genetically modifying organisms can be either beneficial or harmful for humans. As we can be infected by bacteria, we developed antibiotics to fight those infections, and this saves many lives as it is an efficient medicine.</em><em> But when a bacteria is genetically modified to be resistant to antibiotics, we can be harmed as we don't have a way to fight the infection and the bacteria will spread (even maybe kill us).</em><em> T</em><em>herefore, bacteria that are antibiotic-resistant do not benefit humans, and the correct answer is C. bacteria is genetically modified to be antibiotic resistant.</em>
The correct answer is: B) -20 kcal/mol
Enzymes are catalysts of chemical reactions, they speed up the reaction by lowering the activation energy, but don't affect the ∆G (change of Gibbs free energy). The changes in free energy occurs due to change in concentrations of reactants and products and don't have anything to do with the presence or absence of an enzyme.
