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.
Answer: A
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The number one worldwide infectious diseases are ________.
A. respiratory diseases B. AIDS-related diseases C. malaria and other protozoan diseases D. measles and other rash diseases E. diarrheal diseases
A unit of DNA that directs the building of a protein is the ____
a. genotype b. phenotype c. locus d. gene e. chromosome
Which one of the following structures is part of the internal cytoskeleton that supports a cell?
A) rough and smooth endoplasmic reticulum B) flagella and cilia C) microtubules and microfilaments D) lysosomes and peroxisomes E) ribosomes and rough endoplasmic reticulum
Viral meningitis is also called "aseptic meningitis"
A) to indicate no bacteria are involved. B) because it is frequently a nosocomial infection. C) since it is treatable with antiviral medications. D) because it is vaccine-preventable. E) to distinguish it from encephalitis.