A: Nucleic acids are made up of monomers called nucleotides. Each nucleotide consists of a five-carbon sugar, a phosphate group and a nitrogenous base. Repeating nucleotides create nucleic acids such as DNA, or deoxyribonucleic acid, and RNA, or ribonucleic acid.
Pain and discomfort are the main symptoms of angina. Angina often is described as pressure, squeezing, burning, or tightness in the chest. The pain or discomfort usually starts behind the breastbone.Pain from angina also can occur in the arms, shoulders, neck, jaw, throat, or back.ngina often is described as pressure, squeezing, burning, or tightness in the chest. The pain or discomfort usually starts behind the breastbone. Pain from angina also can occur in the arms, shoulders, neck, jaw, throat, or back.
Angina or agina pectoris is a pain in the chest associated with a lack of oxygen to the heart muscle. If deprived of oxygen any muscle will cramp, producing pain: the heart muscle is no exception.he pain of angina can be very difficult to describe. It is often described not so much as a pain, but as a squeezing, tight feeling in the chest. The feeling is also often mistaken for indigestion. The pain can radiate from the centre of the chest to the left shoulder and down the left arm.