Which of the following cells are haploid?

A. oogonium
B. spermatogonium
C. primary oocyte
D. ovum
E. oogonium and spermatogonium


D. ovum

Biology & Microbiology

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About half of all flowering plant species, including many important crop plants, are ____

a. polyploids b. haploids c. aneuploids d. euploids e. diploids

Biology & Microbiology

In the Gram-staining procedure, the decolorizer is

A. crystal violet. B. ethanol or acetone. C. safranin. D. iodine.

Biology & Microbiology

A structure, such as a flower in plants, or a liver in animals, consisting of tissues organized to carry out a specific function is a(n)

A. molecule. B. cell. C. organ. D. population. E. organelle.

Biology & Microbiology

In humans, what percent of the genome is devoted to the exons that encode proteins?

A. about 50% B. about 35% C. about 75% D. about 20% E. about 1.5%

Biology & Microbiology