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.

---

Definitions:

Memory Interference

A phenomenon where one memory competes with or replaces another memory, often leading to forgetting or distorted recollections.

Anterograde Amnesia

The inability to form long-term memories of events occurring after a brain injury or brain surgery, although memories formed before the trauma are usually intact and short-term memory is unaffected.

Hippocampus

A region of the brain associated with memory formation, organization, and storage.

New Memories

Information or experiences that are newly encoded into an individual's memory system.