Week 8 Flashcards
(30 cards)
the term heterotroph refers to an organism that
must obtain organic compounds for its carbon needs
an organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a/an
photoautotroph
aerobic respiration is an example of
chemoheterotrophy
microorganisms that live in severe habitats, such as very hot, acidic, or salty environments, are called
extremophiles
cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37 C incubator and on the shelf of 50 C incubator. After incubation, there were no growth at 37 C and 50 C, slight growth on the bench top and abundant growth at refrigeration. what term could be used for this species
psychrophile
cultures of a bacterial species were incubated out on the incubator shelf, in an anaerobic jar and in a candle jar. after incubation there was moderate growth of cultures in the candle and anaerobic jars, but heavy growth of the culture on the incubator shelf. this species is a/an
facultative anaerobe
an organism with a temp growth range at 45C to 60C would be called
thermophile
human pathogens fall into the group
mesophiles
a microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with
oxygen
an organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a/an
aerobe
a halophile would grow best in
salt lakes
the phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the
stationary phase
the time interval from parent cell to two new daughter cells is called the
generation time
among the microorganisms, various genomes can include
chromosomes, plasmids, mitochondrial DNA, chloroplast DNA
eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have
histone proteins, chromosomes in the nucleus, several to many chromosomes, elongated (not circular) chromosomes
bacterial conjugation involvse
a donor cell with plasmid that synthesizes a pilus
which of the following is not a type of bacterial DNA recombination?
mitosis
the transfer of DNA fragments from a dead cell to a live, competent recipient cell that result in a changed recipient cell is
transformation
a bacteriophage transfers DNA of the previous host to the current host. this is an example of
generalized transduction
physical agents for controlling microbial growth include all of the following, except?
hydrogen peroxide
which of the following microbial forms have the highest resistance to physical and chemical controls?
bacterial endospores
the process that destroys or removes all microorganisms and microbial forms including bacterial endospores is:
sterilization
the use of chemical agents directly exposed on body surfaces to destroy or inhibit vegetative pathogens is
antisepsis
which is correct regarding the rate of microbial death
cells in a culture die at a constant rate
