The Genes Needed for β-Carotene Synthesis Are Not Normally Expressed

question 13

Multiple Choice

The genes needed for β-carotene synthesis are not normally expressed in endosperm. In the creation of golden rice, how did researchers ensure that these genes were expressed in rice endosperm?

• A) The genes were injected only in the endosperm of rice grains.
• B) Agrobacterium cells were added only to rice grains, not to any other part of the plant.
• C) The protein-coding sequence of each gene was linked to a regulatory region of DNA that directed transcription in endosperm.
• D) The wild-type genes were mutated and new mutant alleles that are expressed only in endosperm were selected.

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