Biology Lecture Quiz 3: Chapter 2 and 3
A nuetral atom has an atomic number of 18 and a mass number of 32? How many electrons does it have?
18
A nuetral atom has an atomic number of 18 and a mass number of 32? How many protons does it have?
18
In addition to carbon, an organic molecule must contain
hydrogen
The weak attractions between water molecules (the dotted lines) are known as
hydrogen bonds
Which of the following is a hydrolysis reaction?
glycogen forming glucose molecules
The pH of pure water is [BLANK] because [BLANK].
7.0; water contains an equal number of H+ ions and OH- ions.
A neutral atom has an atomic number of 18 and a mass number 32. How many electrons are in the valence shell of this atom?
8
Which of the following charateristics of water, gives a water molecule the ablilty to cling to another polar surface?
Adhesion
Which of the following statements about basic solutions is true?
Basic solutions release OH-.
Sulfur has an atomic number of 16. How many valence shell electrons does it have?
Six
Which of the following is a steroid that provides stability with the plasma membrane of an animal cell?
Cholesterol
What is the term of the loss of the 3D shape of a protein & thereby elminating its function?
Denaturation
The linear sequence of amino acids in a polypeptide chain is referred to as its [BLANK] structure.
Primary
Which of the following describes saturated fats?
They contain only signal bonds between atoms in their carbon skeleton.
The four main catagories of organic macromolecules are
carbonhydrates, lipids, proteins, and nucleic acids.
Which one of the following is an function of proteins
metabolism
Amino Acids are needed to build [BLANK], just as [BLANK] are needed to create DNA.
proteins; nucleotides
After drinkning a great deal of coffee (pH 5), a human blood buffering system would need to [BLANK] as the coffee was digested to lower the level of acid present in the blood stream
take up H+
As discussed in the Connections for this Chapter, what are omega-3 fatty acids.
unsaturated fats that promote brain and cardiovascular health
The reactivity of an atom depends on the number of...
valence electrons.
