An animal that relies on a digestive tract for digestion breaks down food by
a) intracellular digestion only
b) both intracellular and extracellular digestion
c) extracellular digestion only
d) neither intracellular nor extracellular digestion
Ans: c) extracellular digestion only
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Because zooplankton do not need sunlight they tend to be most concentrated in deeper waters away from the surface
Indicate whether the statement is true or false
Autoimmune diseases are disorders where the immune system fails to distinguish _______ from foreign ones.
What will be an ideal response?
Normal bacterial inhabitants of the human body
a. are naturally resistant to antibiotics. b. are able to out-compete some invading pathogens and thus are one of the body’s initial defense mechanisms. c. can be transformed into pathogenic forms if a person’s resistance to disease is low. d. are unable to survive the human body’s defense mechanisms. e. are able to out-compete some invading pathogens and thus are part of the body’s innate immunity.
The vaccine for which of these pathogens is an inactivated vaccine?
A) Hepatitis B) Human papillomavirus C) Influenza D) MMR E) Chicken pox