You are a NASA scientist and have discovered an organism in outer space that stores its genetic material in the cytoplasm rather than in a nucleus and cannot perform photosynthesis. Given these characteristics, how might you classify this organism?
A. bacteria
B. eukaryote
C. fungi
D. prokaryote
E. archaea
Answer: D. prokaryote
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A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond. B) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines stimulate macrophages to work extra hard to fight infections.
Select all events that occur during the follicular phase (first half) of the ovarian cycle.
Select the best response to the question. ?
?Lyme disease, an illness spread by ticks, is an example of: A) ?transmission by direct contact. B) common vehicle transmission.? C) ?mechanical vector transmission. D) ?biological vector transmission.
In bacterial toxins of the A-B type, the A fragment is responsible for (1) __and the B fragment is responsible for (2)__.
A. (1)Toxin activity (2) binding to cells B. (1) Fever production (2) binding to cells C. (1)Attaching to surfaces (2) interfering with nerve function D. (1) Binding to cells (2) stopping protein synthesis E. (1) killing phagocytic cells (2) lysing host cells