01 - Introduction

Question 1

1. What is a relationship where an organism spends part or all of its life intimately associated with another living thing of a different species

Answer 1

1. symbiosis

Question 2

1. one member benefits, the other is not affected
2. is there physiological interaction of dependency?

Answer 2

1. commensalism
2. no

Question 3

1. mutualist and host depend on each other physiologically
2. who benefits?
3. is relationship obligatory?

Answer 3

1. mutualism
2. both
3. yes

Question 4

1. one lives at expense of other
2. is relationship obligatory?

Answer 4

1. parasitism
2. yes

Question 5

1. What is successful parasitism?

Answer 5

1. must maintain middle ground (must not kill or be killed by host)

Question 6

(Consequences of Parasitism)

1. clinical parasitism
2. sub-clinical parasitism (aka what?)

Answer 6

2. production parasitism

Question 7

1. What are those aspects of the environment supplied by the host which the parasite needs in order to develop? Are these dependent on previous or current presence of the parasite?
2. called what when host doesn’t provide environment for host to develop?

Answer 7

1. susceptibility; no (the physiological state of the host in which the parasite is furnished with its life needs)
2. insusceptibilty

Question 8

1. What are alterations of the physiological state of the host (as a response to current or past experience) – which don’t allow the parasite to develop?

Answer 8

1. resistance

Question 9

1. What is the host in which the parasite reaches sexual maturity or produces its sexual statges?

Answer 9

1. definitive host

Question 10

1. What is an obligate host which alternates with the definitive host and harbors a larval stage of the parasite? (usually where asexual reproduction occurs)

Answer 10

1. intermediate host

Question 11

1. What is a host in which the parasite remains viable, but does not undergo further development or growth?

Answer 11

1. paratenic or transport host

Question 12

1. What is the phase of infection between entry into the host and attainment of sexual maturity?
2. What is the period between infection and eggs passing in the feces?

Answer 12

1. prepatent infection
2. prepatent period (PPP)

Question 13

(Parasite Infection)

1. very common
2. more common in warm-moist areas
3. crowding intensifies
4. worms vs protozoa… infectious? life?
5. hypobiosis = ?
6. worms vs. protozoa… antigenic? Chronic?

Answer 13

4. less; live longer
5. arrested development
6. less, more chronic