Bio Graded Exam 2 PDF

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4/15/2021

Graded Exam 2

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Unit 6: Introduction to the Viruses

Started on Monday, March 22, 2021, 6:06 AM State Finished Completed on Monday, March 22, 2021, 7:00 AM Time taken 54 mins 24 secs Grade 67.50 out of 90.00 (75%)

Question 1

A naked virus only has a/an ______.

Correct 4.50 points out of 4.50

Select one: a. capsomere b. nucleocapsid c. envelope d. antigenic surface

Question 2 Correct

Which organelle contains cristae where enzymes and electron carriers for aerobic respiration are found?

4.50 points out of 4.50

Select one: a. Mitochondrion b. Lysosome c. Golgi apparatus d. Chloroplast e. Endoplasmic reticulum

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Question 3

Graded Exam 2

The glycocalyxof a eukaryotic cellis

Correct 4.50 points out of 4.50

Select one: a. mostly polysaccharides. b. the site where many metabolic reactions occur. c. also called the cell wall. d. composed of many diverse proteins. e. a protective mechanism against osmotic lysis.

Question 4

The function of bacterial endospores is

Correct 4.50 points out of 4.50

Select one: a. reproduction and growth. b. protection of genetic material during harsh conditions. c. storage of excess cellular building blocks. d. to provide a protected site for photosynthesis.

Question 5

Which of the following is not associated with every virus?

Correct 4.50 points out of 4.50

Select one: a. Envelope b. Capsomeres c. Capsid d. Nucleic acid e. Genome

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Question 6

Graded Exam 2

Bacterial cells could have any of the following appendages except ______.

Incorrect 0.00 points out of 4.50

Select one: a. agella b. cilia c. mbriae d. periplasmic agella (axial laments) e. pili

Question 7 Correct

When fungal buds remain attached in a row following cell division, the resulting chains of yeast cells are called ______.

4.50 points out of 4.50

Select one: a. pseudohyphae b. septa c. molds d. dimorphic e. mycelia

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Question 8 Incorrect 0.00 points out

Graded Exam 2

A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the reason for the return of this treatment?

of 4.50

Select one: a. A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death. b. Viruses can infect bacteria, transferring pathogenic genes; the viral genes can then be suppressed, causing the bacteria to not replicate viruses. c. The attachment structures on the virus and the receptors on the host cells make for exquisite specicity of viruses for particular bacterial species. d. Antibiotic resistance in bacteria is on the increase, so using a different kind of therapy offers an alternative to traditional drugs.

Question 9 Correct

Chemical analysis of a bacterial cell detectsdipicolinic acid. What is the identity of this structure?

4.50 points out of 4.50

Select one: a. Cell wall b. Capsule c. Biolm d. Nucleoid e. Endospore

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Question 10 Correct

Graded Exam 2

At present, the most accurate indicator of evolutionary relatedness among organisms isthe

4.50 points out of 4.50

Select one: a. size of the periplasmic space. b. similarities of cell membrane proteins. c. size of the bacterial chromosome. d. sequence of the ribosomal small subunitRNA. e. size of the ribosomes.

Question 11 Correct

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

4.50 points out of 4.50

Select one: a. embryo b. cell c. plaque d. bacteriophage e. egg

Question 12 Correct 4.50 points out of 4.50

Bacterial endospores are produced by ______. Select one: a. Staphylococcus b. Entamoeba c. Bacillus d. Mycoplasma

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Question 13 Correct 4.50 points out of 4.50

Graded Exam 2

Cilia are exhibited by certain ______. Select one: a. protozoa b. algae c. fungi d. bacteria e. viruses

Question 14 Incorrect 0.00 points out

The endosymbiotic theory says that precursor eukaryotic cells acquired ciliaby endosymbiosis with a(n) _____ ancestor and others gained photosynthetic ability from endosymbiosis with a(n) _____ ancestor.

of 4.50

Select one: a. protozoan, algal b. archaeal, cyanobacterial c. spiral, cyanobacterial d. helminth, algal

Question 15

Infectious protein particles are called ______.

Correct 4.50 points out of 4.50

Select one: a. viroids b. phages c. prions d. oncogenic viruses e. spikes

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Question 16

Graded Exam 2

Which of the following will not support viral cultivation?

Incorrect 0.00 points out of 4.50

Select one: a. Live lab animals b. Embryonated bird eggs c. Primary cell cultures d. Continuous cell cultures e. All of the choices will support viral cultivation.

Question 17 Correct

Fungi that grow as yeasts at one temperature but as molds at another temperature are called ______.

4.50 points out of 4.50

Select one: a. dimorphic b. saprobes c. pseudohyphae d. spores e. parasites

Question 18

The chemical components of ribosomes are proteins and ______.

Correct 4.50 points out of 4.50

Select one: a. mRNA b. tRNA c. rRNA d. DNA

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Graded Exam 2

Question 19

Visible, clear, well-dened patches in a monolayer of virus-infected cells in a culture are called ______.

Incorrect 0.00 points out

Select one:

of 4.50

a. patches b. buds c. plaques d. cytopathic effects e. pocks

Question 20

Mycobacterium and Nocardiaare distinguishedfrom other bacteria by the ______ stain.

Correct 4.50 points out

Select one:

of 4.50

a. acid-fast b. methylene blue c. endospore d. Gram e. basic

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Graded Exam 2

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