Mastering Biology Midterm 1 |61 Questions| With Correct Answers.

What is responsible for this change in taste? {Ans: Amylase breaks down the starch in the cracker into glucose monomers, which stimulate the sweet receptors in your tongue}The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases. {Ans: hydrogen bonds}Decreasing the saturation of the fatty acid chains on a particular type of phospholipid would result in the formation of _____. {Ans: more fluid bilayers Unsaturated fatty acids have kinks that prevent tight packing of the hydrophobic tails. This increases the fluidity and permeability of the membrane.}Which of these cannot rapidly pass directly through the phospholipids of the plasma membrane? {Ans: Ions, such as hydrogen ions, and hydrophilic molecules, such as water and glucose, cannot rapidly pass directly through the phospholipids of a plasma membrane. To move rapidly through the membrane, they must pass through membrane transport proteins.}Where is calcium stored? {Ans: smooth endoplasmic reticulum}Which one of these is an amino group? {Ans: NH2. (a)}Which of these is rich in unsaturated fats? {Ans: olive oil}Which of the four major macromolecules of life does NOT form complex structures via polymerization? {Ans: lipids}Each water molecule