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WVU Bio 219 Exam 1: Questions & Detailed Answers
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WVU Bio 219 Exam 1: Questions & Detailed AnswersG-proteins are active when bound to which of the following? Right Ans -
GTP
TRUE or FALSE: G-proteins are turned on by creating GTP from GDP and Pi.
Right Ans - False
TRUE or FALSE: G-proteins are turned off by hydrolyzing GTP to GDP and
phoshpate. Right Ans - True
Which of the following removes GDP and adds GTP (ie: they are exchanged) to
turn on G-proteins? Right Ans - GEF
Which of the following refers to signaling between cells over long distances?
Right Ans - Endocrine
During cell-signalling, where does the ligand bind? Right Ans - The extra-
cellular domain
What does Carl Sagan say we are all made of? Right Ans - Star dust
How many covalent bonds can oxygen form? Right Ans - 2
The following figure shows water molecules (H2O) interacting together.
Which kind of chemical interaction is represented by the solid (undashed)
lines?
Water molecules interacting Right Ans - covalent bonds
Which of the following best describes hydrophobic interactions?
Options: A. The hydrophobic parts of the molecule are attracted to each other?
B. The hydrophilic parts of the molecule are attracted to each other
C. The hydrophobic parts of the molecule are driven together to avoid water
and other hydrophilic or polar molecules. Right Ans - C. The hydrophobic
parts of the molecule are driven together to avoid water and other hydrophilic
or polar molecules.
, Which of the following is the strongest bond in an aqueous environment, like a
cell? Right Ans - Covalent bonds
Protein components Right Ans - amino acids
nucleic acids components Right Ans - nucleotides
Polysaccharide components Right Ans - Monosaccharides (glucose,
galactose)
Lipid Components Right Ans - Glycerol, Fatty Acids, Steroids
Protein Assemblers Right Ans - Ribosomes
Nucleic Acid Assemblers Right Ans - Polymerases
Polysaccharide Assembler Right Ans - Glycosyl transferases
Lipid assemblers Right Ans - Fatty acid syntheses
Secondary and higher structures are formed by Right Ans - Intra-molecular
assembly using non covalent interactions
Superstructures are built by Right Ans - Inter-molecular assembly using
non-covalent interactions
protein self-assembly drivers Right Ans - hydrophobic- hydrophobic
interactions
Charged- ionic interactions
uncharged/polar- hydrogen and covalent bonds
nucleic acid self assembly drivers Right Ans - Hydrogen bonding
Lipid self assembly driver Right Ans - hydrophobic interactions
Polysaccharide self assembler Right Ans - None
Which of these amino acids is likely to form an ionic bond with lysine?
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