Though not exact, the statement that best describes how a liver cell and skin cell have the exact same DNA sequence and yet look different and perform different functions is the last one, the DNA is expressed differently, which leads to proteins being "expressed" differently in each cell.
During early embryonic development, the few cells that make up our organism are totipotent in nature. A totipotent cell is one with the capability to produce any tissue in the human body. All the cells that later make up our bodies are derived from these.
This explains that although not all of the DNA sequence is expressed at all times, the DNA is still present in the cell, meaning that <u>option 1 is false</u>. <u>Option 2 is also false</u> due to the fact that although mutations can occur from time to time, they are certainly not a common process nor are they normal. Finally, <u>option 3 is false</u> given that tRNA's only role is to apport the correct amino acid for each sequence.
As development continues, cells specialize into specific tissues. They do this by compressing certain areas of their DNA, making it unreadable and therefore limiting the expression of that area of the genetic code. This causes the proteins that are synthesized to be unique for each type of tissue.
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Answer:
All of the above
Explanation:
Digestion or breakdown of food in our body can either be physical/mechanical or chemical/enzymatic. As rightly stated in this question, the manual breakdown of food by the teeth is not enough, chemical digestion must occur via the aid of proteinous substances called ENZYMES. Enzymes, which are secreted by certain organs in the body, do the following:
- They speed up the rate of chemical reactions by lowering the activation energy needed for the chemical process, allowing more productivity.
- Enzymes help break down various sugars that can then be absorbed e.g amylase helps break down starch, proteases break down proteins, lipases break down lipids etc.
I think b would be the correct answer. uhm, report my answer if b is incorrect
All of the above is the answer.