Why might tardigrades make good organisms for space flight? What will be an ideal response?
ANSWER: Tardigrades have traits to make them very good candidates. For one, they can go dormant for
years which could be beneficial for the flight. Second, they can tolerate extreme hot and cold
which could be experienced on the journey. Third, they are very small so they would not
need a large craft.
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Which of the following manipulations would reduce the release of neurotransmitter from a presynaptic neuron terminal?
I) reduction in extracellular calcium ion concentration at the axon terminal II) increase in extracellular sodium and potassium ion concentrations at the axon terminal III) addition of tetrodotoxin to the extracellular fluid at the axon terminal A) only I B) only II C) only III D) only II and III E) only I and II
An organ must contain at least
A. two different tissue types. B. two different cell types. C. all four of the tissue types. D. connective tissue. E. two different muscle types.
When a person's blood pH is too low, the kidneys will restore a healthier balance by ________
A) secreting more sodium ions into the urine B) reabsorbing more hydrogen ions from the filtrate C) secreting excess hydrogen ions into urine D) slowing ventilation
Ovulation occurs by a surge in the secretion of what hormone?
A. follicle stimulation hormone B. estrogen hormone C. hCG hormone D. luteinizing hormone E. progesterone hormone