Which of the following is a polymer?
A. testosterone, a steroid hormone
B. cellulose, a plant cell wall component
C. glucose, an energy-rich molecule
D. triacylglycerol, or fat
E. fructose, a component of sucrose
Answer: B. cellulose, a plant cell wall component
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Until the late 1970s, there was no "Domain" as the broadest category in taxonomy. Instead, there were five kingdoms: Protista, Plantae, Fungi, Animalia, and Monera, which included all bacteria-like organisms. Researchers proposed the domains to distinguish between the bacteria-like organisms. Which information supported the domain level, and subsequent domains of Bacteria, Archaea, and Eukarya?
A. More complex emergent properties developed after organisms were originally categorized into kingdoms. B. Organisms in the Bacteria and Archaea domains have a nucleus, whereas eukaryotes do not. C. Cell shapes of bacteria and archaea were found to be more distinct, after microscope technology improved. D. Differences in DNA among the existing kingdoms showed a need for a broader naming category. E. Evolution led to new adaptations and diversity of organisms.
Why is Graves’ disease dangerous? What will be an ideal response?
A cytologist is examining a tissue under an electron microscope. He notices that the endoplasmic reticulum of each cell is extremely rough in appearance, and he knows that the rough appearance is because of the ribosomes embedded there. He asks why there are so many ribosomes. You respond,
A. "This tissue exports lipids and is very involved with mRNA production." B. "This tissue exports various nucleic acids, hence the large number of ribosomes present on the endoplasmic reticulum in each of those cells." C. "This tissue exports proteins to other areas of the body."
A chemical reaction in which a water molecule is a reactant is known as a (dehydration/hydrolysis) reaction.
Fill in the blank(s) with the appropriate word(s).