HW2 Flashcards
What unique property of carbon enables this element to be a “Lifes Chemical Backbone.”
Carbon behaves as if it has four valence electrons.
Lipids and water do not mix because.
Lipids are nonpolar, and water is polar.
What is not a component of an amino acid?
Phosphate
Fatty acids that carry no c-c double bonds are referred to as what.
saturated
Adjacent nucleotides in an RNA are held together by.
Covalent bonding
The covalent linkage joining two amino acids together is referred to as..
Peptide Bond
Secondary structure is characterized by what type of interactions.
Hydrogen bonding within peptide backbone.
Which of the environmental factors affect the interactions between amino acids that, in turn, determine the shape of a protein?
-temperature and ion concentration
-pH
-hydrophilic or hydrophobic properties of the environment.
Which changes in the fatty acids of phospholipids would be most effective in maintaining membrane fluidity in a colder environment?
a decrease in phospholipid fatty acid side chain length and a decrease in side chain saturation
Which is more likely to form a micelle rather than a liposome if mixed in an aqueous environment?
Phospholipids with a single fatty acid tail.
An amphipathic molecule is one that:
Contains both polar and nonpolar regions.
The interior region of a phospholipid bilayer is characterized as:
hydrophobic
Which substance could most easily cross a synthetic membrane composed of phospholipids but not proteins?
Oxygen(O2)
The protein-assisted movement of a polar molecule across the membrane that does not require ATP or the input of energy occurs through:
Facilitated Diffusion
