Why are embryonic stem cells different from adult stem cells?
a. they can become any kind of cell (totipotent)
b. they are haploid
c. they have different genes
d. they are committed
Answer: a. they can become any kind of cell (totipotent)
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Microphylls are found only in __________
a. hornworts b. liverworts c. club mosses d. ferns e. whisk ferns
A cerebral embolism blocks an artery carrying blood to the ________
Fill in the blank(s) with correct word
The purpose of a mordant in the Gram stain is
a. To make the flagella visible. b. To remove the simple stain. c. To make gram-negative cells visible. d. To make the bacterial cells larger. e. To prevent the crystal violet from leaving the cells.
Nucleic acids are polymers of , which are molecular complexes of three subunits: a phosphate, a sugar, and nitrogen base.
A. Nucleotides. B. Nucleosides. C. Nuclei of heavy metals. D. Proteins.