It is called lock and key model. it theorize that enzymes and its substrate behave like a lock and key which fits into each other and does not fit into any other system(lock or key)
Answer:
<h2>D. Radioactive nitrogen in the DNA of the bacterial cells is present in one strand of the DNA of all of the cells.</h2>
Explanation:
As given here,
The nitrogenous base of DNA is radio active labeled, and is grown in normal unlabeled medium.
As we know that DNA replication occurs in semi-conservative way, so after one round of replication, one parental strand would be radio active and other newly synthesized strand would be unlabeled.
So here, after one round of replication, one strand of all the newly synthesized DNA would be radio active and other strand would be normal.
Cooking an egg is a set of chemical changes because chemical bonds are broken and new ones are made, resulting in the formation of new substances. In this case many of the bonds broken are those which cause the egg's proteins to be folded into a globular shape. The protein chains unfold and become entangled causing the setting effect. This is often called denaturing. Whether or not a change can be reversed has no bearing on whether it is chemical or physical. This particular change is almost impossible to reverse because of entropy effects but that simply isn't true of all chemical reactions, and there are many physical changes which are hard to reverse.
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Answer: D. To suspend organelles and other subcellular parts
Explanation:
Plz lmk if i'm wrong :)
