The concept of a species was proposed by

A. Charles Darwin.
B. John Ray.
C. Carolus Linneaus.
D. Erasmus Darwin.
E. George Cuvier.


B. John Ray.

Biology & Microbiology

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The building blocks of DNA are called _________

A. amino acids B. codons C. nucleotides D. alleles

Biology & Microbiology

An animal cell contains ___________ genome(s), while a plant cell contains ___________ genome(s).

A. 1,1 B. 2,2 C. 2,3 D. 3,2 E. 1,2

Biology & Microbiology

Elevations of which of the following antibodies may indicate a parasitic infection?

a. IgG b. IgA c. IgM d. IgE

Biology & Microbiology

An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart. What mechanism normally prevents this from happening?

A. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. The embryo's secretion of FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. C. The follicle's secretion of polar bodies maintains the fimbriae, keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones. D. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones.

Biology & Microbiology