#Question id: 11438
#Unit 1. Molecules and their Interaction Relevant to Biology
Two of the common amino acids are analyzed. At pH = 7.0, amino acid X is negatively charged while amino acid Y is positively charged. Which will be a characteristic of amino acid X?
#Question id: 5011
#Unit 11. Evolution and Behavior
A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from lungs of an ancestral fish is an example of
#Question id: 10396
#Unit 6. System Physiology – Plant
#Question id: 5015
#Unit 11. Evolution and Behavior
During which of the following largest mass extinction recorded in the history of life on Earth.
#Question id: 11165
#Unit 2. Cellular Organization
Membrane lipids in tissue samples obtained from different parts of a reindeer’s leg have different fatty acid compositions. Membrane lipids from tissue near the hooves contain a larger proportion of unsaturated fatty acids than those from tissue in the upper leg. What is the significance of this observation?