*random biology flashcards*
Intramolecular forces
strong attractive forces that hold atoms within a molecule
Intermolecular forces
exist between molecules
True or false: intramolecular forces are far weaker than intermolecular forces
False - intramolecular forces are much stronger
Intermolecular forces are significant because:
they determine physical properties such as boiling point, melting point, density, etc.
empirical formula for carbohydrates
(CH2O)n
How would we label a ringed sugar that has its hydroxyl group pointing down?
Alpha. OH is trans to the CH2OH group
Whenever a carbohydrate attaches to another molecule, it forms a _____ bond
glycosidic
sucrose
glucose + fructose
maltose
two glucose
lactose
galactose + glucose
what is cellulose
structural polysaccharide found in plant cell walls, wood, paper
cellulose contains ___ linkages which form ____ strands
B-1,4 (beta 1,4); linear
True or false: cellulose is a highly rigid structure
True. Due to B-1,4 linkages to pack strands linear and parallel (due to H bonding between adjacent strands)
True or false: humans cannot digest cellulose
True. It passes through our digestive tracts as fiber
proteome
all of the proteins expressed in a cell
genome
all of the dna in a cell
amino acids form peptide bond with each other via:
dehydration/condensation reactions
What is hybrid sterility?
when a hybrid zygote is sterile and cannot reproduce
Behavioral isolation occurs when:
different species do not perform the right type of mating rituals, hence preventing mating
Gamete isolation
occurs when gametes from different species do not recognize and thus cannot fertilize each other
Hybrid mortality
a hybrid zygote dies before reaching a reproductive age
Hybrid F2 breakdown
when the second generation of hybrids suffer from decreased fitness
Postzygotic isolation includes:
Hybrid mortality, hybrid F2 breakdown, hybrid sterility
Semelparity
describes the animals that only mate once in their entire life; produce many offspring from their single “reproductive episode;” however, the babies they make have a low chance of surviving to adulthood
Starch function
form of energy storage in plants
What type of bonding is found in starch
alpha bonded
Linear starch is known as
amylose
Branched form of starch is called
amylopectin