PLEASE HELP AS SOON AS POSSIBLE!
1) Which of the following is an example of hydrogen bond?
a) the peptide bond between amino acids in a protein
b) The bond between an oxygen atom and a hydrogen in the carboxyl group of a fatty acid.
c) The bond between Na+ and Cl- salt.
d) the attraction between a hydrogen of one water molecule and the oxygen of another water molecule.
e) the bond between carbon and hydrogen in methane
2) The nitrogenous base, adenine is found in which three of the following
a) Proteins, chlorophyll
b) protein, ATP, and DNA
c) ATP, DNA, and RNA
d) Chlorophyll, ATP, and DNA
e) Proteins, carbohydrates, and ATP
3) A feature of organic compounds NOT found in inorganic compounds is the presence of
a) ionizing chemical groups
b) electrons
c) carbon atoms covalently bonded to each other
d) oxygen
e) hydrogen bonds
4) which of the following is a correct statement about the relationship between pH and the hydrogen- ion concentration of a solution?
a) there are no hydrogen ions present in a solution with a basic pH
b) there are no hydrogen ions present in a solution with a neutral pH of 0.7
c) the concentration of hydrogen ions in a solution with a pH of 7.0 is 100 times as great as that in a solution with a pH of 9.0
d) the concentration of hydrogen ions in a solution with a pH of 5.0 is twice as great as that in a solution with a pH of 1.0
5) Which of the following pairs of functional groups characterizes the structure of an amino acid?
a) nitrogen bonded with 2 hydrogen & carbon double bonded with oxygen and single bonded with R
b) Carbon double bonded with oxygen and single bonded with OH & Nitrogen bonded with 2 hydrogen
c) carbon double bonded with oxygen and single bonded with OH & carbon double bonded with oxygen and single bonded with R
d) -OH & nitrogen bonded with 2 hydrogen
e) carbon bonded with 1 Hydrogen and 2 carbons & Nitrogen bonded with 2 hydrogen
6) The bonding of two amino acids molecules to form a larger molecule requires
a) the release of a water molecule
b) the release of a carbon dioxide molecule
c) the addition of a nitrogen atom
d) the addition of a water molecule
e) an increase in activation energy
7) Animals produce most of their nitrogen-containing wastes during
a) protein digestion
b) carbohydrate digestion
c) lipid digestion
d) glycogen synthesis
e) production of charismatic gradients
8) Which of the following is most abundant carbon-containing compound in the atmosphere of the earth?
a) carbon monoxide
b) carbon dioxide
c) carbon tetrachloride
d)ethane
e) ozone
9) Which of the following carbon compounds is standardly utilized as an energy source by heterotrophs?
a) calcium carbonate
b) carbonic acid
c) organic molecules
d) carbon dioxide
e) carbon monoxide
10) Which of the following is responsible for the cohesive property of water?
a) hydrogen bonds between the oxygen atoms of two adjacent water molecules
b)covalent bonds between the hydrogen atoms of two adjacent water molecules
c) hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule
d) covalent bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule
e) hydrogen bonds between water molecules and other types of molecules
11-14. Each group of questions in this section consists of five lettered choices followed by a list of numbered phrases or sentences. For each numbered phrase or sentence select the one heading that is most closely related to it.
a) protein
b)carbohydrates
c) nucleic acid
d) lipids
e) steroids
11) includes molecules that function as cellular signals, receptors, enzymes, transporters, and carriers
12) includes glycogen, chitin, cellulose, and glucose
13) used for insulation and buoyancy in marine arctic animals
14) used to carry the genetic code
15-19) refer to the following list of biomolecules
a)glucose
b) glycerol
c) glycogen
d) glucagon
e) guanine
15) a nitrogen base of nucleic acids
16) essential for the synthesis of fats
17) a storage form of carbohydrate in muscle
18) a monosaccharide
19) a purine
20-24) refer to the following list of bimolecular
a) glycocalyx
b) cholesterol
c) triglyceride
d) phospholipid
e) protein
20) Carbohydrate-containing layer coating the surface of the cell membrane
21) the major component of the bilayer of a cell membrane
22) structural molecule that enables muscle contraction
23) steroid affecting the fluidity of the plasma membrane
24) pepsin, digestive enzyme produced in mammalian stomachs
1) Describe three types of bonds/interactions found in proteins. For each type, describe its role in determining protein structures.
2) Protein structure can be affected by environmental conditions. Identify two factors and explain the mechanism by which each affects protein structure
3) describe 2 other molecules (NOT PROTEINS) and explain how the structure of these molecules is important for their function.