Describe how you can tell the difference between simple squamous epithelium and simple cuboidal epithelium.
What will be an ideal response?
Simple squamous epithelium is composed of flattened cells that form a permeable barrier that allows the exchange of substances.
Simple cuboidal epithelium is composed of a single layer of cube-shaped cells that are often involved in the absorption of substances.
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The reaction of ethanol fermentation is: pyruvate + NADH ? ethanol + CO2 + NAD+. Why would a yeast need to perform this reaction in the absence of oxygen?
A. To produce CO2 for respiration. B. To produce NAD+ allowing glycolysis to continue. C. NADH is necessary to reduce pyruvate to lactate. D. To produce NAD+ allowing the electron transport chain to run. E. To consume excess pyruvate that cannot enter the Krebs cycle.
In which stage of aerobic respiration is water produced?
A. The electron transport system B. Glycolysis C. The Krebs cycle
____________________ are evidence of life in the distant past.
Fill in the blank(s) with the appropriate word(s).
Which organelle contains almost all of the genetic material of the cell?
Nucleus Nucleolus Rough endoplasmic reticulum Cytoplasm