Answer:
DNA: Three nucleotides encode an amino acid. Proteins are built from a basic set of 20 amino acids, but there are only four bases. Simple calculations show that a minimum of three bases is required to encode at least 20 amino acids.
RNA: You can think of the sequences of bases in the coding strand of DNA or in messenger RNA as coded instructions for building protein chains out of amino acids. There are 20 amino acids used in making proteins, but only four different bases to be used to code for them. Obviously one base can't code for one amino acid.
Answer:
They are seed plants and consequently do not rely on water for fertilization as do the ferns and mosses.
Explanation:
Answer;
-Channel, Recognition, reception, transport
Explanation;
Membrane proteins serve a number of functions:
• Channel proteins: allow dissolved molecules to diffuse through the membrane. Some of these proteins are structured in a way that allows only certain small molecules or ions through.
• Carrier proteins: These have binding sites that allows them to bind to certain substances and physically move the substance from one side of the membrane to the other.
• Receptor proteins: These proteins have active sites shaped to fit specific signal molecules, such as hormones. Once the protein is activated by the substance, it sets off a series of changes in the cell,such as increased metabolic rate or cell division.
• Recognition proteins: These proteins, called glycoproteins (glyco = sugar) have complex carbohydrates attached to them. These form the identification system that allows your body cells to recognize each other as self instead of foreign.
• Protein filaments: Long strands of protein on the inside surface of the membrane help support and strengthen the cell membrane, forming the cytoskeleton.
Answer:
Eukaryotes grow and reproduce through a process called mitosis. ... Most prokaryotes reproduce asexually and some through a process called binary fission. During binary fission, the single DNA molecule replicates and the original cell is divided into two identical daughter cells.
Explanation:
A. Gap Junctions
Explanation - Cardiac muscle cell are able to contract in synchronized manner because of the gap junctions of intercalated discs. The action potential is expanded by the gap junction to support the coordinated contraction of the cardiac muscle.
Excitation contraction coupling or ECC is the process by which contraction of muscle occurs. It converts the electrical stimulus sent by the neurons to mechanical response to promote the movement of the muscle. Gap junctions thus helps in connecting the cardiac muscle cell.
