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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

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

Ellen is pregnant and tells Janet, one of her coworkers, that she is scheduled to get a fetal sonogram. Janet expresses alarm and warns Ellen about the danger of exposing a fetus to X-rays. Discuss why you think Janet’s concern is warranted of unwarranted. 

26) In a workout your muscle cells produce lactate, yet you maintain a constant blood pH because ________.    A) endothelial cells secrete excess H+ to prevent a decrease in pHB) the respiratory system removes excess H+ from the blood before the pH is loweredC) metabolic acids are neutralized in muscle cells before released into the bloodD) metabolic bases are produced at the same rate by muscle cells to neutralize the acidsE) the body contains chemicals called buffers that resist changes in pH

29) A ________ reaction breaks a ________ down into its monomers.A) dehydration synthesis; polymerB) polymer; moleculeC) hydrolysis; polymerD) condensation; reactantE) dehydration synthesis; molecule

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

20) The bonding properties of an atom are determined by its ________.    A) electronsB) photonsC) neutronsD) protonsE) positrons

Biological membranes contain bilayers containing mostly _________ blank.

Experiments are carried out to test a hypothesis by changing one variable at a time and should include an unchanged variable termed a(n) _________ blank.

What is the first stage of Jean Piaget’s cognitive development and what occurs in this stage?