Which of the following membrane lipids does not contain a fatty acid tail?
(a) phosphatidylcholine
(b) a glycolipid
(c) phosphatidylserine
(d) cholesterol
(d)
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New genetic variations sometimes become more common within populations because ____
a. most parts of the genome are non-coding and available for selection b. proteins can be "recruited" for advantageous function c. the resulting proteins are advantageous and selected for by nature d. adaptation occurs rapidly in the few species that have survived through time e. mutations are able to select against genetic variations that had disadvantageous function
How is reverse transcriptase used to clone genes?
a. Reverse transcriptase is used to make a cDNA copy of an mRNA strand. b. Reverse transcriptase is used to make a cloned DNA copy of a plasmid DNA molecule. c. Reverse transcriptase is necessary to read the information contained on the cDNA molecule. d. Reverse transcriptase transcribes RNA from cDNA in reverse order. e. Reverse transcriptase transcribes cDNA into RNA without transcription of introns.
Which of the following receptors are MOST likely to demonstrate receptor adaptation?
A) pain receptors B) olfactory receptors in the nose C) photoreceptors in the eye D) stretch receptors in the muscles and tendons E) mechanoreceptors in the cochlea (ear)
Scientists examined the diversity of primary and secondary consumers from intertidal communities in four regions of the world:
Benguela along the coast of South Africa (BEN), California along the coast of North America (CAL), Humboldt along the coast of Chile in South America (HUM), and New Zealand (NZ). The number of organisms per square meter (mean density), which is a unit that represents total biomass of primary consumers (herbivores) and secondary consumers (carnivores), is plotted for each of these four regions on the graph below. Note: Image from Blanchette et al. (2009). Trophic structure and diversity in rocky intertidal upwelling ecosystems: A comparison of community patterns across California, Chile, South Africa and New Zealand. Progress in Oceanography 83: 107-116. After examining the graph, complete the following sentence. The black portion of each bar represents the percentage of [primary / secondary] consumers, whereas the gray portion of each bar designates the percentage of [primary / secondary] consumers from the four intertidal communities. What will be an ideal response?