How did oxygen gas buildup in air following the evolution of photosynthesis?
What will be an ideal response?
Cells that used photosynthesis were very successful. Oxygen gas (O2) released from uncountable numbers of water molecules began seeping out of photosynthetic prokaryotes. The gas reacts easily with metals, so at first, most of it combined with metal atoms in exposed rocks. After the exposed minerals became saturated with oxygen, the gas began to accumulate in the ocean and the atmosphere. From that time on, the world of life would never be the same.
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Insulin is a product of
A. pancreatic ?-cells. B. pancreatic ?-cells. C. pancreatic exocrine cells. D. the kidney. E. the liver.
The gene responsible for Marfan syndrome encodes a protein associated with ____
a. heart muscle b. connective tissue c. fat tissue d. red blood cells e. nervous tissue
Cortisol is a steroid hormone that induces physiological changes including _______.
a. Activation of immune system b. Elevation of glucose level in blood c. Activation of bone formation d. All of the above e. b and c
Stress, relaxation, hunger, consuming the wrong foods, and too much or too little sleep can contribute to which of the following?
A) stroke B) headache C) spinal cord injury D) coma