can somebody help me with these questions? 1) the oxygen we breath is used in: a
ID: 87037 • Letter: C
Question
can somebody help me with these questions?
1) the oxygen we breath is used in:
a)electron transport
b)fermentation
c)glycolysis
d)krebs cycle
e)all of these processes use oxygen
2) which of the following are factors that contribute to evolution by natural selection?
a)some traits are better suited for a particular environment than others.
b) those traits that affect survival and reproduction are heritable
c) genetic variation
d)environmental stressors.
e) all of these are correct.
3) you get a summer internship working as a lab technician in a physiology lab. You are assigned a project to investigate the osmotic tolerance of mammalian cells.you are required to collect living cheek cells by gently scraping the inside of the mouth of volunteers, examining the cells under a microscope, and recrding their responses when you treat them with different solutions with unknown solute concentrations. You treat a sample of cheek cells with a solution ,and when you examine the cells under a microscope, you see they have shriveled. You can conclude:
a) cheek cells were hypoosmotic ( hypotonic) to the solution.
b) cheek cells were isosmotic (isotonic) to teh solution.
c) the solution disrupted chaperone proteins in the cheek cells , causing the collapse of the cytoskeleton.
d)cheek cells were hyperosmotic ( hypertonic) to the solution.
e) none of these are correct.
Explanation / Answer
Answer
1. option a is the right answer because the oxygen we breath used as electron acceptor at the end of the electron transport chain and convert into water.
2. Option e the right answer because all above factors contribute to the evolution by natural selection. In a process of natural selection environment stressor select some traits that are better suited for a particular environment than other. these particular traits come from genetic variation and are heritable.
3. option a is the right answer because cheek cells were hypoosmotic (hypotonic ) to the solution which will loose the water to the outer solution by the process of osmosis.
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