Macromolecules SC 912 L 18 1 Animals breathe

Macromolecules SC. 912. L. 18. 1

Animals breathe in oxygen (O 2). This O 2 is used in their bodies in the breakdown of the glucose and fatty acids. The main function of the breakdown of glucose and fatty acids is to provide energy for chemical reactions by producing which of the following? A. enzymes B. deoxyribonucleic acid C. adenosine triphosphate D. proteins

What biological macromolecule is generally insoluble in water and functions in an important role in biological membranes? A. carbohydrates B. proteins C. nucleic acid D. lipids

Which of the following best describes the major function of the biological macromolecule DNA? A. provides the energy required by the cell B. synthesizes RNA C. stores information thattranslatesintomaking proteins D. decreases the activation energy required for a reaction

This type of macromolecule is composed of fused carbon rings, and resembles a piece of honeycomb. A. carbohydrate B. steroid C. nucleic acid D. protein

Which answer best describes how carbohydrates and lipids are similar? A. Both contain fats and oils and have an important structural function within the cell. B. Both are polymers that are linked by peptide bonds. C. Both are nucleic acids involved in making ATP. D. Both contain carbon, hydrogen, andoxygen, and are down as a source of energy. andbroken are broken as a source of energy.

Which biological molecule transports substances, speeds up reactions, makes hormones, and provides structural support? A. carbohydrates B. proteins C. deoxyribonucleic acid D. adenosine triphosphate

Amylase is an enzyme found in saliva that begins the digestion process. After the amylase has acted on a food particle, which of the following is true? A. the mouth cells must produce more amylase to replace it B. the amylase isis stillpresentand andabletotocatalyze another reaction C. the amylase bonds to a mouth cell to prevent it from being moved to the stomach D. the amylase becomes a biologically inert particle

Nucleotides consist of a phosphate group, a nitrogenous base, and which of the following? A. fatty acids B. an amino acid C. a 5 -carbon sugar D. glycerol

As food travels through the digestive system, it is exposed to a variety of p. H levels. The stomach has a p. H of 2 due to the presence of hydrochloric acid (HCl), and the small intestine has a p. H ranging from 7 to 9. HCl? HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens in to pepsin as it enters the small intestine? A. it becomes inactive B. it begins to replicate C. its shape changes to engulf large proteins D. its activity increases to digest more proteins