bio145 quiz 3 (ch 6-7) Flashcards
0
Q
An organism that is a \_\_\_\_\_ can make its own organic molecules from CO2 and gets energy from light A) photoautotroph B) chemoautotroph C) lithotroph D) microaerophiles
A
A) photoautotroph
1
Q
Which of the following terms best describes an organism that cannot exist in the presence of oxygen? A) facultative anaerobe B) obligate anaerobe C) facultative anaerobe D) obligate aerobe
A
B) obligate anaerobe
2
Q
Facultative anaerobes like yeast and E. coli can live with or without A) carbon B) nitrogen C) sugar D) oxygen
A
D) oxygen
3
Q
Neutrophiles, acidophiles, and alkalinophiles are all adapted to live in different \_\_\_\_ conditions A) temperature B) osmotic pressure C) pH D) hydrostatic pressure
A
C) pH
4
Q
Cells that shrink in hypertonic solutions such as salt water are responding to \_\_\_\_\_ pressure. A) osmotic B) barometric C) hydrostatic D) peer
A
A) osmotic
5
Q
Organic chemicals required for metabolism that cannot be synthesized by the organism A) peptides B) growth factors C) waste D) pH
A
B) growth factors
6
Q
The temperature at which an organism's metabolic activities produce the highest growth rate is\_\_\_\_\_ A) minimum growth temperature B) maximum growth temperature C) 37 degrees Celsius D) optimal growth temperature
A
D) optimal growth temperature
7
Q
Quorum sensing is ____
A) a characteristic of most bacteria
B) dependent on direct contact among cells
C) the ability to respond to changes in population density
D) associated with colonies on an agar plate
A
C) the ability to respond to changes in population density
8
Q
Dental plaque and "soap scum" are examples of \_\_\_\_, which are associations of numerous microorganisms that communicate and coordinate and act similar to a tissue A) biofilm B) acidophiles C) colonies D) medium
A
A) biofilm
9
Q
This statement "in the laboratory, a sterile inoculating loop is moved across the agar surface in a culture dish, thinning a sample and isolating individuals" describes which of the following? A) broth culture B) pour plate C) streak plate D) dilution plate
A
C) streak plate
10
Q
The phase of growth where dying cells equals the number of cells being produced and the population size remains constant is\_\_\_\_. A) lag phase B) log phase C) stationary phase D) decline phase
A
C) stationary phase
11
Q
\_\_\_\_\_ is the time required for a single cell to grow and divide. A) log phase B) decline phase C) arithmetic growth D) generation time
A
D) generation time
12
Q
Which of the following is a true statement concerning prokaryotic chromosomes?
A) they typically have many origins of replication
B) they contain single-stranded DNA
C) they are located in the cytosol
D) they are associated in linear pairs
A
C) they are located in the cytosol
13
Q
A nucleotide is composed of\_\_\_\_\_ A) a five-carbon sugar B) phosphate C) a nitrogenous base D) all of the above
A
D) all of the above
14
Q
Circular DNA independent of chromosomes, which can carry genes for resistance and virulence, are called? A) plasmids B) nucleosomes C) histones D) chromatin
A
A) plasmids
