The Earliest Photosynthetic Organisms

question 62

Multiple Choice

The earliest photosynthetic organisms:

• A)probably did not produce oxygen.
• B)probably used water as a source of hydrogen.
• C)probably used hydrogen sulfide as a source of hydrogen.
• D)date back to the time when life first emerged on Earth.
• E)possessed chloroplasts.

Recognize the role and function of the major ions in neural activity, such as sodium and potassium.

Acknowledge the impact of disorders related to the nervous system, focusing on myelin sheath degeneration.

Comprehend the processes involved in neurotransmitter release and reception, and their importance in neural communication.

Recognize the protective roles of glial cells in the central nervous system.

---

Definitions:

Ti Plasmid

A plasmid found in the bacterium Agrobacterium tumefaciens, used in genetic engineering to transfer genes to plant cells.

Agrobacterium Tumefaciens

A species of bacteria that is known for its ability to transfer DNA to plants, causing plant tumors (galls). It is used in genetic engineering to create genetically modified plants.

Complementary Nucleotide Sequences

refer to sequences of DNA or RNA where each nucleotide is matched by a specific partner: adenine with thymine (or uracil in RNA) and cytosine with guanine.

Cloned Genes

Refers to copies of a gene that have been produced identical to the original sequence, often used for research or genetic modification.