Cell junction structure involves primarily which of the following type of molecule?
a. Protein
b. Lipid
c. Nucleic Acid
d. Carbohydrate
e. None of the above
Answer is a. Protein (Junction structure consist of multi protein complexes that provide contact between neighboring cells or between a cell and the extracellular matrix.)
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Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
A) The energy in them can be stored as fat, which has high energy per unit weight. B) The carbons in carbohydrates are rich in energy because they are highly oxidized. C) Carbohydrates are reduced molecules that have high-energy electrons. D) This is an advertising gimmick that has no scientific evidence to support it.
One of the early groups of organisms to evolve is the placozoans. Placozoans have some similar characteristics to fungi. Which of the following is not a characteristic that is shared by fungi and placazoans?
A. upper and lower epithelial layers B. high surface area-to-volume ratio C. gas exchange via diffusion D. extracellular digestion
In arthropods, molting is necessary because the chitinous exoskeleton cannot grow.
a. true b. false
A scientist is working with fungi in his lab, and in doing so he chemically modifies the cellular environment of the fungi so plasmogamy can occur, but karyogamy cannot occur. Explain what would happen with the fungi in this new circumstance.
A. Hyphae would fuse but cytoplasm would not fuse. B. Cells would fuse but maintain separate nuclei. C. Cells would not produce hyphae. D. Cells would not produce gametes. E. Cells would not produce cytoplasm.