24. Why does the water move in the direction shown in the diagram? movement of water a. The water moves to the area where the concentration of the solute is low. b. The water moves from an area of high water concentration to an area of low water concentration. C. d. 27. 25. Which organs are involved in the human excretory system? kidneys, bladder, ureters, and urethra a. b. c. d. 26. What is the advantage of excreting urea rather than ammonia as waste? urea is less toxic than ammonia a. b. C. d. c. d. The water moves from an area where the solution of the solute is high. The water moves from an area of low water concentration to an area of high water concentration. Where does the filtrate go from the distal convoluted tubule? a. Bowman's capsule b. a. liver and pancreas liver, kidneys, and bladder sweat glands and skin b. C. d. urea requires less water for excretion urea is very soluble all of the above 28. Steroid hormones proximal convoluted tubule loop of Henle collecting duct are derived from cholesterol. are polar molecules. act on cell membrane receptors. are water soluble.
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
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