Each __________ develops into a pollen grain. Fill in the blank(s) with the appropriate word(s)
microspore
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Tumor suppressor genes:
A. encode proteins that drive the cell cycle forward. B. encode proteins that suppress development. C. encode proteins that suppress cell division. D. encode proteins that suppress DNA repair. E. encode proteins that suppress metabolism.
One mechanism of genomic imprinting silences an allele by DNA ____
a. methylation b. mutation c. transposition d. deletion e. inversion
The letter "A" in the above figure represents
a. pericycle b. endodermis c. primary xylem d. root cortex e. primary phloem
Cats cannot synthesize the amino acid taurine. This means that in cats, taurine
A. is not a required nutrient. B. is an essential amino acid. C. is a nonessential amino acid. D. must be stored in cellular compartments. E. is not present in their normal diet.