Companion cells are specialized cells found in which plant tissue?
A) meristematic tissue B) ground substance
C) phloem D) xylem
Answer: C
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The malarial parasite growing within erythrocytes is more resistant than the free parasite to the drug chloroquine
Indicate whether the statement is true or false.
Phenotypic similarity does not always reflect evolutionary relationships due to
A. outgrouping. B. convergent evolution. C. homoplasy. D. variation in rates of evolutionary change among species.
Which result is an observed effect of global warming on organisms?
A) Some species of birds and frogs now begin their breeding seasons earlier in the year. B) Corals "bleach" when decreased water temperatures cause them to expel their symbiotic algae. C) Many butterfly populations have shifted their ranges toward the equator. D) Many polar bears produce more offspring as their hunting grounds increase in size.
Antibiotics stop working effectively when antibiotic resistance occurs. Which of the following does not contribute to an increase in antibiotic resistance?
A) taking antibiotics for viral diseases B) increase of good bacteria in the body C) stopping antibiotics as soon as you feel better D) antibiotics in animal feed