Homework 1 Flashcards
what type of bond links carbohydrate monomers together
glycosidic bonds
what is the name of an atom carrying an overall positive charge
cation
T or F: hydrogen bonds are a covalent bond forming between dipoles
true
this level of protein structure is best defined as three dimensional globular structure of a single polypeptide chain
tertiary
what nucleotide base is found in RNA but not DNA
uracil
T or F: hydrolysis uses water to combine two reactants into a single product
false
what is the difference in protons between a pH of 3 and a pH of 1
100x
T or F: saturated fatty acids are solid at room temperature and their fatty acid tails contain no double bonds
true
fimbraie
short, bristle-like structures primarily used for attachment
pili
hair-like appendage that can be used for conjugation
flagella
long filament used for motility
capsule
coating around the cell that excludes small particles
circular bacteria growing in a chain would best be characterized as
streptococci
T or F: teichoic acid is found in the cell wall of gram-positive bacteria but NOT gram-negative bacteria
true
what type of environment is characterized by a lower concentration of solute outside the cell than inside the cell
hypotonic
extrachromosomal, circular DNA found in many types of bacteria
plasmids
T or F: gram-negative bacteria have a thicker layer of peptidoglycan than is found in gram-positive bacteria
false
T or F: the Black Death that killed so many people during the middle ages is caused by a dangerous virus
false
which individual was the first to use microscopy to visualize bacteria cells
van Leeuwenhoek
T or F: the idea of “washing hands to prevent the spread of pathogens” introduced by Ignaz Semmelweis was immediately popular and instituted at all major hospitals
false
which group is not considered “fully alive” due to not being made of a cell or cells
viruses
