RNA. A type of nucleic acid consisting of nucleotide monomers with a ribose sugar and the nitrogenous bases adenine (A), cytosine (C), guanine (G), and uracil (U); usually single-stranded; functions in protein synthesis and as the genome of some viruses.
Underactive thyroid Photo Credit George Doyle/Stockbyte/Getty Images. It's hard to lose weight when your metabolism slows down, but there are things you can do. The thyroid, a butterfly-shaped gland in your throat, produces hormones that regulate many bodily functions, including metabolism.ollow a low-calorie diet. Anyone who wants to lose weight must burn more calories than are consumed. Unfortunately, for someone with an underactive thyroid, it can be difficult because the metabolism slows, meaning the body naturally burns fewer calories.
An underactive thyroid can make you feel tired and gain weight, but it could also be the cause of other things, such as depression and infertility. When most people think of hypothyroidism symptoms, fatigue and weight gain usually come to mind. But hypothyroidism symptoms vary from person to person, says Antonio Bianco, MD, PhD, an endocrinologist at the BiancoLab at Rush University Medical Center in Chicago.