The limbic system of the brain gets stimulated when an individual experiences fear and pleasure.
The limbic system is a part of our brain which is responsible for the regulation of our emotional and behavioral responses, especially the ones we need for our survival. The structures of the limbic system are embedded deep in the brain. The two major structures of the limbic system include the hippocampus and the amygdala. The hippocampus helps us associate emotions and senses with different memories. The amygdala plays a pivotal role in managing our strong emotions like aggression, fear and pleasure. It also helps us in making new memories.
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I'll give you an example.
If two tectonic plates clide, more or less in a head-on collision, they form a convergent plate boundary.
Usually, one of the converging plates will move beneath the other, which is known as
subduction.
Deep trenches are often formed where tectonic plates are being subducted, and earthquakes are common.
The answer is; DNA helicase
They unzip the double helix into single strands during replication. The unzipping occurs at regions called origins where replication is initiated. The protein breaks the hydrogen bonds (using energy from ATP) between the complimentary bases of the strands hence forming a replication fork.
The sample that is being discussed in the problem can be either DNA or RNA.
DNA and RNA are both very important molecules. Both of these hold immense value in biology since they store all the vital information required for living. The basic structures of the two are quite similar; the only difference is that DNA is double-stranded while RNA has a single strand.
DNA and RNA molecules both contain a five-carbon sugar (ribose), a phosphate group, and a nitrogenous base. Except for cytosine, guanine, and adenine, the fourth part is the phosphate group that exists in both. RNA has Uracil while DNA has Thymine.
Since it has not been mentioned here what the fourth part might be, the sample might be a DNA or an RNA molecule.
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