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Questions in biology

[Terjawab] Select the best answer for the question. 7. Fish respiratory systems exchange gas and receive oxygen at the gills. This oxygen then enters the blood stream and is pumped through the heart and back through the gills without first returning to the heart. This order of events best describes which type of circulation system? A. Recycling B. Open C. Double loop D. Single loop

[Terjawab] Impulses travel over the synapse through which of the following? A. axon terminals B. neurotransmitters C. myelin sheaths D. Schwann cells

[Terjawab] Which is a key component of the energy molecule ATP? A. sodium B. phosphorus C. chlorine D. sulfur

[Terjawab] The relationship between bacteria and legumes that results in nitrogen is best described as A. parasitic B. mutualistic C. commensalistic D. none of the above

[Terjawab] Fiona puts her hands into a sinkful of lukewarm water; Luke puts his hands into a sinkful of ice-cold water. Based on what is known about neural transmission, you could predict that the action potentials will: A. be weaker in Fiona's system because the stimulus is less intense B. be the same in both individuals due to the all-or-none principle C. travel a shorter distance in Luke's system because the stimulus is more intense D. travel more quickly in Luke's system because the stimulus is more intense

[Terjawab] Which term refers to variables that are kept constant in an experiment? A. Independent variables B. Dependent variables C. Controlled variables D. Experimental variables

[Terjawab] The carbon cycle ensures that carbon is not lost. Which is another important benefit of the carbon cycle? A. The carbon cycle helps regulate Earth's temperature. B. The carbon cycle ensures that living things have a continual source of hydrogen. C. The carbon cycle helps transport nutrients in bodies of water. D. The carbon cycle ensures that there is a continual supply of water.

[Terjawab] Which of the following areas are not part of extrastriate cortex? A. V2 B. V3 C. V4 D. V1

[Terjawab] What kind of nutrient comes from water and air? A. mineral nutrients B. non-mineral nutrients

[Terjawab] What are the major positive ions situated outside the neuron when it is polarized? A. magnesium ions B. sodium ions C. calcium ions D. potassium ions