<span>Proper control over the contents of a cell is essential in ensuring that the cell maintains homeostasis and is able to operate within its necessary bounds. And that very important responsibility falls to the cell's plasma membrane, which is the barrier that serves as the interface between the cell and the exterior, including with regards to allowing the passage of solutes across the cell boundary.</span>
Answer:
DNA is essentially a storage molecule. It contains all of the instructions a cell needs to sustain itself. These instructions are found within genes, which are sections of DNA made up of specific sequences of nucleotides. In order to be implemented, the instructions contained within genes must be expressed, or copied into a form that can be used by cells to produce the proteins needed to support life.
The instructions stored within DNA are read and processed by a cell in two steps: transcription and translation. Each of these steps is a separate biochemical process involving multiple molecules. During transcription, a portion of the cell's DNA serves as a template for creation of an RNA molecule. (RNA, or ribonucleic acid, is chemically similar to DNA, except for three main differences described later on in this concept page.) In some cases, the newly created RNA molecule is itself a finished product, and it serves an important function within the cell. In other cases, the RNA molecule carries messages from the DNA to other parts of the cell for processing. Most often, this information is used to manufacture proteins. The specific type of RNA that carries the information stored in DNA to other areas of the cell is called messenger RNA, or mRNA
Explanation:
Answer:
D. Arg is replaced by His
Explanation:
The code is read in groups of 3 (triplets), so the triplet that is changed is:
G<u>C</u>A -> G<u>T</u>A
From the table, we know that GCA results in the amino acid ARG.
However the C changed to a T in the mutation so the trip is now GTA which codes for His instead according to the table. Therefore Arg is replaced by His. It is option D.
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B: they release hydroxide ions in solutions. i wasn't sure if you had meant acids/bases or DNA/bases. Glad you made it clear. You meant acid/bases.
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