Why might some cells uncouple the electron transport chain?
a. A cell does not require ATP.
b. Cells can use the energy from the proton gradient for functions other than producing ATP, such as heat generation.
c. Uncoupling proteins offset the effect of cyanide.
d. Too much ATP is bad for the cell.
Answer: b. Cells can use the energy from the proton gradient for functions other than producing ATP, such as heat generation.
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Homo erectus has been shown to have dispersed from
A. Africa. B. Asia. C. South America. D. Europe. E. North America.
Small internal cell structures are best visualized with a
A. dark-field microscope. B. flagellar microscope. C. light microscope. D. transmission electron microscope.
Energy captured by producers usually passes through no more than four or five trophic levels. Even in ecosystems with many species, the number of participants in each food chain is limited. The inefficiency of energy transfers constrains the length of food chains. What factors limit the efficiency of energy transfers?
What will be an ideal response?
A gene is coded for only one protein and associated with only one specific tissue type. Is this statement correct and why?
A. No, all genes can encode more than one protein in multiple tissue types due to exon splicing formation. B. Yes, all tissue-specific proteins are only expressed from a single gene for that specific tissue. C. Yes, all genes only code for one protein normally specific to one tissue type. D. No, some genes can be go through alternative splicing leading to the production of different proteins in different tissues.