A normal heart rate ranges between 60-100 beats per minute. The higher the heart rate is, the faster the blood is pumping through the heart. When exercising a persons heart will be higher because the brain and the muscles in the body are in need of oxygen so the heart needs to pump faster in order to sustain optimal performance.<span />
Answer:
Option B is correct.
Explanation:
There are <u>thousands</u> of proteins and only 20 amino acids.
Hope I helped!
Best regards! :D
~
<h2>Messenger RNA
</h2>
Explanation:
Messenger RNA results from the breakage and recombining of DNA strands that is known as transcription
- Transcription always starts at a specific site called promoter
- Promoter are specific sites on DNA where RNA Polymerase binds and initiates transcription
- Synthesis of RNA occurs in 5'-3' direction and continuous
- Only a strand of DNA act as template, template is also known as antisense strand or non coding strand
- The complementary strand is the sense strand or the coding strand
- Only a small segment of DNA is transcribed at a time generally called gene
