Microsporidians are considered parasitic because of the ability to penetrate their host cells using _____
A) a mycelium
B) a polar tube
C) sporangia
D) chitin
Answer: B
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What is considered a normal blood pressure?
a. 100 / 60 b. 65 / 100 c. 80 / 120 d. 120 / 80 e. 140 / 120
Which of the following statements about components of the flu vaccine and their intended function is true?
A. Gelatin or sorbitol is used to enhance the ability of the immune system to detect the virus. B. Formaldehyde is used to inactivate toxins from the virus or bacteria that may have been present during production. C. Antibiotics are used as a preservative in multidose vials of vaccine in order to prolong their shelf life. Antibiotics allow the vaccine to withstand extreme temperature changes. D. Aluminum is included to prevent the growth of bacteria during vaccine preparation and storage.
It is proposed that Cro-Magnons were responsible for the extinction of many large mammals during the Pleistocene epoch. How could this feat have been accomplished?
A. Cro-Magnon man was the first species of hominids to hunt in groups. This would have increased their chance of killing larger animals. B. Cro-Magnon man was the first species of hominid to use fire. This would have increased their success during hunting. C. Cro-Magnon man was the most efficient bipedal species. They would have been able to run after prey species more efficiently than any of their predecessors. D. Cro-Magnon man had an increase in tool technology that enabled them to kill animals from a distance.
Which of the following statements best reflects the nature of synaptic plasticity?
(a) New synapses are created due to the postnatal generation of neurons. (b) Synaptic response changes in magnitude depending on frequency of stimulation. (c) There is a change in the type of neurotransmitter used at the synapse. (d) Neuronal connections are pruned during normal development.