What is the solvent in which the chemical reactions of living cells take place?
True or False, Water can hydrogen bond
what allows water to maintain its liquid state in cellular environments?
The cohesive forces caused by hydrogen bonding between water molecules squeeze __________ molecules away from the water and cause them to aggregate.
How do hydrophillic molecules dissolve easily in water?
becuase the molecule's negatively charged ends attract the positively charged hydrogens of water, and the positively charged ends of the hydrogen attract the negatively charged oxygen of the water, so the water molecule completely surrounds the hydrophillic molecule and it seperates it from the group.
True or False, water can only act as a solvent
False, water can act as a solvent, reactant, or product.
Lipids have low solubility in ______, and high solubility in ____________________
water, nonpolar organic solvents
True or False, lipids are hydrophillic
False, they are hydrophobic and make excellent barriers between aqueous environments
What are the 6 major groups of lipids?
fatty acids, triacylglycerols, phospholipids, glycolipids, steroids, and terpenes
what are the building blocks for most complex lipids?
Fatty acids are long chains of ______ with a ______________ at the end
carbons, carboxylic acid
what is the maximum number of carbons in a fatty acids chain in humans?
T/F, Fatty acids are saturated
False, they can be saturated or unsaturated.
what kind of bonds do saturated fatty acids posess?
Single Carbon-Carbon bonds
what kind of bonds do unsaturated fatty acids posess?
one or more Carbon-Carbon double bonds
C. constructed from a 3 carbon backbone called glycerol, which is attached to 3 fatty acids
D all of the baove
D. all of the above
What are the functions of Triacyglycerols?
their functions in a cell is to store metabolic energy, provide thermal insulation and padding to an organism
What are Adipocytes?
specialized fat cells whose cytoplasm contains almost nothing but triglycerides
T/F, both phospholipids and triacylglycerols are built from a gycerol backbone
how are phospholipids different from triacylglycerols?
Phospholipids have a polar phosphate group which replaces one of the fatty acids on the opposite side of the glycerol