If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?
A) carbon dioxide
B) cytokinins
C) ethylene
D) auxin
E) gibberellic acids
Answer: C
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RNA and proteins combine in cells to form structures called ribosomes. Ribosomes contain the active site for peptide bond formation. Based on their chemical structures, do you think protein or RNA molecules actually form the active site within the ribosom
A) protein, because RNA cannot catalyze reactions B) RNA, because proteins cannot catalyze a reaction that involves another protein C) proteins, because only proteins can catalyze a reaction that involves another protein D) It could be either, because both molecules have catalytic properties.
The circulatory systems of bony fishes, rays, and sharks are most similar to _____
A) those of birds, with a four-chambered heart B) the portal systems of mammals, where two capillary beds occur sequentially, without passage of blood through a pumping chamber C) those of reptiles, with one pumping chamber driving blood flow to a gas-exchange organ, and a different pumping chamber driving blood to the rest of the circulation D) those of sponges, where gas exchange in all cells occurs directly with the external environment E) those of humans, where there are four pumping chambers to drive blood flow
A researcher is interested in creating a phylogenetic tree showing the evolutionary relationship of several
cyanobacterial species based on the closeness of their nitrogenase gene sequences. Which field of research most directly applies to the researcher’s project?
a. comparative proteomics b. comparative genomics c. comparative transcriptomics d. comparative phylogenetics e. comparative phenotype
Which of the following is the best definition of sympatric speciation?
a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. divergence within a population leads to speciation in the absence of a physical barrier to gene flow.