Answer: Option E) polar
Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar
Explanation:
Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains.
Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.
The two-layered sac surrounding the heart is the pericardium.
Hope this helps!
Saphrophytic nutrition is all about obtaining nutrients from non-living organic matter, usually dead and decaying plant or animal matter, by absorbing soluble organic compounds.
The answer is constructive interference because two waves meet at one point of the room and amplifies sound.
Antibiotics, are helpful for treating the common cold, however due to them being very powerful medicine, they are not highly recommended.
