BIO 250 FINAL EXAM NEWEST 2024 ACTUAL
EXAM 200 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+.
A student is observing microorganism in a sample of pond water.one
organism of interest has an obvious nucleus, small oval structures
containing a green pigment, and does not appear to be motile. In
which of the following groups would this microbe most likely be
classified? - ANSWER>>> Eukaryotes(algae)
The relationship between specific bacteria and specific diseases was
first demonstrated by Koch. - ANSWER>>> true
Which microbial group includes beneficial microorganism that fix
nitrogen and make antibiotics, as well as harmful microorganism that
cause disease such as plague and strep throat? - ANSWER>>>
bacteria
A 30X objective and a 20X ocular produce a total magnification of _. -
ANSWER>>> 600X
Immersion oil can be used to increase the resolution achieved with
some microscope lenses because it increases the _ between the
specimen and the objective lens. - ANSWER>>> refractive index
Resolution improves when the the wavelength of the illuminating light
decreases. T/F - ANSWER>>> true
If the decolorizer is left o too long in the gram-staining procedure,
gram-postive organisms will be stained _ and gram-negative
organisms will be stained_. - ANSWER>>> pink,pink
,Mordants increases the binding between a stain and specimen. T/F -
ANSWER>>> true
Glass has a greater refractive index than air. This means that _. -
ANSWER>>> the velocity of the light is slowed when it passes
through the glass from the air
The cell membrane is a rigid structure that provides bacteria with the
characteristic shapes. T/F - ANSWER>>> False
Gram-postive bacteria have a structurally and chemically more
complex cell wall than gram-negative bacteria. T/F - ANSWER>>>
False
Growth factors are molecules that cannot be synthesized by the
bacteria that use them and include amino acids, pyrimidines, and
vitamins. T/F - ANSWER>>> true
_ are the site of protein synthesis in the cell. - ANSWER>>>
ribosomes
The term used to describe bacteria that are shaped like curved rod is
_. - ANSWER>>> vibrio
Square planar arrangement of cells that form when round bacteria
remain attached to each other during reproduction are called _. -
ANSWER>>> tetrads
Different transport systems for the same nutrient that are part of the
same organism are usually regulated in different ways. T/F -
ANSWER>>> true
Predict how the plasma membrane fatty acid composition would
change as the temperature of the habitat of an aquatic bacterial
species warms from 2 degree C to 15 degree C during the spring and
summer months. - ANSWER>>> The percentage of saturated fatty
acids would increase
, Viruses constitute the fourth domain of life in current biological
classification schemes. T/F - ANSWER>>> false
The ribosomal RNA studies that led to the division of prokaryotic
organism into the bacteria and the archaea were begun by _. -
ANSWER>>> woese
Fanny Hesse first suggested that agar be used to solidify
microbiological media. T/F
EXAM 200 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+.
A student is observing microorganism in a sample of pond water.one
organism of interest has an obvious nucleus, small oval structures
containing a green pigment, and does not appear to be motile. In
which of the following groups would this microbe most likely be
classified? - ANSWER>>> Eukaryotes(algae)
The relationship between specific bacteria and specific diseases was
first demonstrated by Koch. - ANSWER>>> true
Which microbial group includes beneficial microorganism that fix
nitrogen and make antibiotics, as well as harmful microorganism that
cause disease such as plague and strep throat? - ANSWER>>>
bacteria
A 30X objective and a 20X ocular produce a total magnification of _. -
ANSWER>>> 600X
Immersion oil can be used to increase the resolution achieved with
some microscope lenses because it increases the _ between the
specimen and the objective lens. - ANSWER>>> refractive index
Resolution improves when the the wavelength of the illuminating light
decreases. T/F - ANSWER>>> true
If the decolorizer is left o too long in the gram-staining procedure,
gram-postive organisms will be stained _ and gram-negative
organisms will be stained_. - ANSWER>>> pink,pink
,Mordants increases the binding between a stain and specimen. T/F -
ANSWER>>> true
Glass has a greater refractive index than air. This means that _. -
ANSWER>>> the velocity of the light is slowed when it passes
through the glass from the air
The cell membrane is a rigid structure that provides bacteria with the
characteristic shapes. T/F - ANSWER>>> False
Gram-postive bacteria have a structurally and chemically more
complex cell wall than gram-negative bacteria. T/F - ANSWER>>>
False
Growth factors are molecules that cannot be synthesized by the
bacteria that use them and include amino acids, pyrimidines, and
vitamins. T/F - ANSWER>>> true
_ are the site of protein synthesis in the cell. - ANSWER>>>
ribosomes
The term used to describe bacteria that are shaped like curved rod is
_. - ANSWER>>> vibrio
Square planar arrangement of cells that form when round bacteria
remain attached to each other during reproduction are called _. -
ANSWER>>> tetrads
Different transport systems for the same nutrient that are part of the
same organism are usually regulated in different ways. T/F -
ANSWER>>> true
Predict how the plasma membrane fatty acid composition would
change as the temperature of the habitat of an aquatic bacterial
species warms from 2 degree C to 15 degree C during the spring and
summer months. - ANSWER>>> The percentage of saturated fatty
acids would increase
, Viruses constitute the fourth domain of life in current biological
classification schemes. T/F - ANSWER>>> false
The ribosomal RNA studies that led to the division of prokaryotic
organism into the bacteria and the archaea were begun by _. -
ANSWER>>> woese
Fanny Hesse first suggested that agar be used to solidify
microbiological media. T/F
