18) The most abundant element in the human body, by weight, is ________.    A) calciumB) carbonC) oxygenD) nitrogenE) hydrogen

11) Which of the following lists levels of human structure from the most complex to the simplest?A) Organelle, cell, tissue, organ, organ systemB) Organ system, organ, cell, tissue, organelleC) Organ, organ system, tissue, cell, organelleD) Organ system, organelle, tissue, cell, organE) Organ system, organ, tissue, cell, organelle

9) Stereoscopic vision provides ________. A) color perception B) bipedalism C) opposable perception D) depth perception E) opposition of thumbs

27) A chemical reaction that removes electrons from an atom is called a(n) ________ reaction.A) anabolic    B) reductionC) hydrolysis    D) condensationE) oxidation

19) Sodium has an atomic number of 11 and an atomic mass of 23. Sodium has ________.A) 12 neutrons and 11 protonsB) 12 electrons and 11 protonsC) 12 electrons and 11 neutronsD) 12 protons and 11 electronsE) 12 protons and 11 neutrons

Suppose a pregnant woman with severe morning sickness has been vomiting steadily for several days. How will her loss of stomach acid affect the pH of her body fluids? Explain 

10) An ________ is composed of two or more tissues types, whereas ________ are microscopic structures in a cell.A) organ; moleculesB) organelle; moleculesC) organ; organellesD) organ system; organellesE) organ system; organs

12) Which of the following lists examples of body structures from the simplest to the most complex?A) Protein, mitochondrion, adipocyte (fat cell), connective tissue, stomachB) Protein, stomach, connective tissue, adipocyte (fat cell), mitochondrionC) Mitochondrion, connective tissue, protein, stomach, adipocyte (fat cell)D) Protein, adipocyte (fat cell), stomach, connective tissue, mitochondrionE) Mitochondrion, connective tissue, stomach, protein, adipocyte (fat cell)

Macromolecules are broken down to monomers in _________ blank

Sugars dissolve well in water because of water’s ________.