BIO 250 FINAL EXAM NEWEST 2024 ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

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BIO 250 FINAL EXAM NEWEST 2024 ACTUAL EXAM 200

QUESTIONS AND CORRECT DETAILED ANSWERS

(VERIFIED ANSWERS) |ALREADY GRADED A+

A student is observing microorganisms 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?

A. Eukaryotes (Fungi)

B. Eukaryotes (Algae)

C. Bacteria

D. Archaea

E. Eukaryotes (Protozoa) - ANSWER- B. Eukaryotes (Algae)

70. A student is observing microorganisms in a sample of pond water.

One organism of interest has an obvious nucleus and has been moving

rapidly during observation and appears to have rows of cilia along its

surface. In which of the following groups would this microbe most

likely be classified?

A. Eukaryotes (Fungi)

B. Eukaryotes (Algae)

C. Bacteria

D. Eukaryotes (Protozoa) - ANSWER- D. Eukaryotes (Protozoa)

Morphovars, serovars, biovars, and pathovars are examples of terms that

refer to microbial _______________.

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A. species

B. strains

C. types

D. Archaea - ANSWER- B. strains

In a search for new antibiotics, a previously unknown organism has been

recovered from the soil. It is nonmotile and is composed of long

threadlike structures formed from nucleated cells. It is notphotosynthetic and absorbs its nutrients. This organism will most likely

be classified among the

A. Bacteria

B. Archaea

C. Eukaryotes (Fungi)

D. Eukaryotes (Protozoa)

E. Eukaryotes (Algae) - ANSWER- C. Eukaryotes (Fungi)

Three the SSU rRNA sequences of 3 organisms have been compared.

For organisms 1 and 2, two of the twelve nucleotides in the sequence are

different. For organisms 1 and 3, six of the twelve nucleotides are

different. Which organism has greater evolutionary distance from

organism 1?

A. Organism 2

B. Organism 3

C. The evolutionary distance is the same.

D. Evolutionary distance cannot be predicted from this data. -

ANSWER- B. Organism 3

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77. Which group of microbes contains organisms necessary for

production of wine and bread?

A. Bacteria

B. Archaea

C. Fungi

D. Algae - ANSWER- C. Fungi

Confocal microscopes exhibit improved contrast and resolution by

A. illumination of a large area of the specimen.

B. blocking out stray light with an aperture located above the objective

lens.

C. use of light at longer wavelengths.

D. use of ultraviolet light to illuminate the specimen. - ANSWER- B.

blocking out stray light with an aperture located above the objective

lens.

5. A 30x objective and a 20x ocular produce a total magnification of

A. 230x

B. 320x

C. 50x

D. 600x - ANSWER- D. 600x

A 45x objective and a 10x ocular produce a total magnification of

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A. 900x

B. 55x

C. 450x

D. 145x - ANSWER- C. 450x

A microscope that exposes specimens to ultraviolet, violet, or blue light

and forms an image with the light emitted at a different wavelength is

called a __________ microscope.

A. phase-contrast

B. dark-field

C. scanning electron

D. fluorescence - ANSWER- D. fluorescence

8. 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.

A. optical density

B. refractive index

C. optical density and refractive index

D. neither optical density nor refractive index - ANSWER- B. refractive

index

If the objective lenses of a microscope can be changed without losing

focus on the specimen, they are said to be

A. equifocal.

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