The continued high frequency of the sickle allele (S) of hemoglobin in Africans, in some Mediterranean populations, and in populations descended recently from Africans is a reflection of the response of ____ to a regional disease
Fill in the blank with the appropriate word.
natural selection
Biology & Microbiology
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Viruses have both an intracellular and an extracellular form
Indicate whether the statement is true or false.
Biology & Microbiology
Which of the following would NOT be considered a synovial joint?
a. hip bone to femur b. elbow c. joints between vertebrae d. shoulder to upper arm e. knee
Biology & Microbiology
The amateur scientist (Koch/Leeuwenhoek/Pasteur) made his own microscopes and first reported the existence of microbes.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The two types of structural symmetry in viruses are rod-shaped ________ and ________ (spherical) symmetry
a. bacillus / coccus b. coccus / bacillus c. helical / icosahedral d. icosahedral / helical
Biology & Microbiology