BIO250 Exam 2 (A++++ Answer)

Question 1

Amoebic dysentery is most commonly contracted through the

Select one:

a. Fecal oral route from contaminated food or water

b. Direct transmission from one host to another

c. Puncture wounds

d. Insect bites

e. None of the choices are correct

Question 2

A bacterial genus that has waxy mycolic acid in the cell walls is

Select one:

a. Mycobacterium

b. Mycoplasma

c. Streptococcus

d. Corynebacterium

e. Salmonella

Question 3

Classification of viruses into families involves determining all the following characteristics except

Select one:

a. Type of nucleic acid

b. Type of capsid

c. Presence of an envelope

d. Biochemical reactions

e. Number of strands in the nucleic acid

Question 4

The basal body of a flagellum in gram-positive bacteria is anchored into the

Select one:

a. Hook

b. Outer membrane

c. Cell wall

d. Peptidoglycan layer

e. Cell membrane

Question 5

Lysogeny refers to

Select one:

a. Altering the host range of a virus

b. Latent state of herpes infections

c. Virion exiting host cell

d. Viral genome inserting into bacterial host chromosome

e. None of the choices are correct

Question 6

Reverse transcriptase synthesizes

Select one:

a. The positive RNA strand from a negative RNA strand

b. A negative RNA strand from a positive RNA strand

c. Viral RNA from DNA

d. Viral DNA from RNA

e. None of the choices are correct

Question 7

Which of the following is not a viral order in the classification system?

Select one:

a. Caudovirales

b. Vaccinia virus

c. Nidovirales

d. Mononegavirales

e. All of the choices are viral orders

Question 8

Spirochetes have a twisting and flexing locomotion due to appendages called

Select one:

a. Flagella

b. Cilia

c. Fimbriae

d. Periplasmic flagella (axial filaments)

e. Sex pili

Question 9

The envelope of enveloped viruses is

Select one:

a. Identical to the host plasma membrane

b. Only compose of host endomembrane

c. Always includes spikes

d. Is obtained by viral budding or exocytosis

e. None of the choices are correct

Question 10

Host range is limited by

Select one:

a. Type of nucleic acid in the virus

b. Age of the host cell

c. Type of host cell receptors on cell membrane

d. Size of the host cell

e. All of the choices are correct

Question 11

Spirochetes are able to move due to:

Select one:

a. A periplasmic flagellum

b. A membrane bound flagellum

c. Cilia serving as walking feet

d. Pseudopods

Question 12

Lysozyme is most effective against

Select one:

a. Gram negative organisms

b. Gram positive organisms

c. Mycoplasmas

d. Cyanobacteria

e. Archea

Question 13

Chloroplasts are composed of membranous sacs called _____ that carry  hlorophyll. Surrounding these sacs is a ground substance called _____.

Select one:

a. Thylakoids, stroma

b. Granna, stroma

c. Cristae, stroma

d. Cristae, matrix

e. Thylakoid, matrix

Question 14

The outcome of the Gram stain is based on differences in the cell's

Select one:

a. Ribosomes

b. Inclusions

c. Cell wall

d. Cell membrane

e. Flagella

Question 15

Most fungi obtain nutrients from dead plants and animals. These fungi are called

Select one:

a. Saprobes

b. Parasites

c. Substrates

d. Nonseptate

e. Dimorphic

Question 16

Adulthood and mating of helminths occur in which host?

Select one:

a. Primary host

b. Secondary host

c. Definitive host

d. Transport host

e. Mating takes place in all hosts

Question 17

After returning from a trip to Africa, Tom begins to feel very tired and weak. He has severe anemia. A blood smear reveals a protozoan is present in his blood. The health care provider tells Tom he has malaria. Which of the following could be the causative agent of his disease?

Select one:

a. HIV

b. T. solium

c. Plasmodium malariae

d. Trichophyton

Question 18

The endosymbiotic theory has been developed to explain the emergence of

Select one:

a. Archea

b. Bacteria

c. Prokaryotes

d. Eukaryotes

e. None of the choices are correct

Question 19

Which of the following is not a division of Kingdom Prokaryote according to Bergey's Manual of Determinative Bacteriology?

Select one:

a. Gracilicutes

b. Scotobacteria

c. Firmicutes

d. Tenericutes

e. Mendosicutes

Question 20

Parasitic worms have a highly developed ______ system.

Select one:

a. Digestive

b. Nervous

c. Respiratory

d. Muscular

e. Reproductive