Answer:
<em>The correct option is C.</em>
Explanation:
The structure mentioned in the question is cell membrane. The cell membrane can be described as a semi-permeable membrane which regulates the export and import of particles across the cell membrane. Some molecules move inside the cell along the concentration gradient by passive transport while other molecules move inside through active transport i.e against the concentration gradient.
The cell membrane is made up of phosphate head and fatty acid tails.
Answer: uncharged particle found in atomic nuclei
Explanation: A neutron is one of the three components of an atomic nucleus. A neutron has no charge that is, it is unchanged. An atom has three components: electrons, protons and neutrons. The neutrons and protons are located inside the nucleus of an atom while electrons are found outside the nucleus where they revolve round the nucleus. The number of neutrons and protons in a nucleus of an atom makes up the mass number of an element.
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Answer:
Clonal selection can be defined as methods or processes that shows(describes) tthe way lymphocytes do react or respond to the various different types of antigens present in a particular body. Clonal selection is of the notion that lymphocytes are taken during antigen presentation .
Explanation:
Clonal selection is important as it is sometimes used during negative selection during T cell maturation. it is believe to be a major cause mutations of antigen-binding affinity in memory cells during clonal expansion .
