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