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a) Why did mammals, including humans, evolve to produce lactase as children but not adults?
b) Why has the ability to produce lactase as an adult evolved in some human populations but not others?
The main of eukaryotic cells are on the order of 10-100 micrometers in diameter. Bacterial cells are smaller, typically in 1-10 micrometers.
you have purified DNA from you recently deceased goldfish. Which of the following restriction nucleases would you use if you wanted to end up with DNA fragments with an average size of 70 kilobase pairs (kb) after complete digestion of the DNA? Th..
Determine the principal reaction that makes an organic, nitrogen containing molecule, capturing the nitrogen in ammonia created through nitrogen fixation.
An investigator has purified tubulin subunits and added everythingto a test tube required for microtubule polymerization
How many different kinds of atoms or functional groups would be covalently bonded to a carbon that showed asymmetry and could exist
Explain about the cell wall and nucleoid of bacterial cell, their structure and composition in detail. Explain the functions of the sensory neurons, interneurons, and motor neurons in the nervous system in brief.
Compare and contrast mutation rate and mutation frequency. Describe the implications for organisms that have long life spans (e.g., humans) and short life spans (e.g., mice). Spontaneous mutation rates in humans are generally higher than in E. col..
Create a pure-breeding double-mutant apricot, blunt line and cross it with wild-type wasps. The F 1 is wild-type in appearance.
q. 1. modern theory suggests that an early pre-life atmosphere on earth was a reducing one. why for what reasons is it
Their water vascular system with tube feet is unique. Sea lilies (Crinoids) might be closest to the ancestral echinoderm. Other groups are modified from this. Chordates -An interesting sidelight: Which side is up.
Describe what kind of changes need to occur in the motor neuron and its target muscle in order for a synapse to form. What kinds of proteins/organelles need to be summoned to the area in each cell?
Recognize and discuss three problems faced by conservation biologists working with small populations that are separated from each other in fragmented habitats.
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