Answer:
A. sharing electrons
Explanation:
A covalent bond consists of the simultaneous attraction of two nuclei for one or more pairs of electrons.
Answer:
A, These proteins are created in the body by condensation of amino acids under the influence of enzyme catalysts, using patterns or direction from the nucleic acids in the cells. The amino acid units in a protein molecule are held together by peptide bonds, and form chains called polypeptide chains.
Explanation:
Answer:
They increase neurotransmitter activity within certain areas of the brain associated with impulse control.
Answer:
The correct answer is e. all of the above.
Explanation:
Nurse cells are also called sertoli cells and are located in the seminiferous tubules in the testes. They provide nourishment to the growing sperms by providing nutrients from surrounding cells.
During the development of of sperms they become genetically different from other cells so nurse cells form blood testes barrier to protect them from immune cells.
Nurse cells concentrate the testosterone in seminiferous tubules which is necessary for proper development of sperms. They also secrete inhibin which stop FSH secretion from anterior pituitary therefore regulate the spermatogenesis.
