Although most animals are bilaterally symmetrical, a few exhibit radial symmetry. What is an advantage of radial symmetry?
a. It allows the animal to gather food from all sides.
b. It confuses predators.
c. It allows the animal to undergo rapid, purposeful movement in any direction.
d. It lets the animal use its dorsal surface as a sensory organ.
a. It allows the animal to gather food from all sides.
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A college student spent the week hiking on the Appalachian Trail and then spends Friday night walking around New York City's Time Square. What was her ecological footprint during the week compared to Friday night?
A. Her ecological footprint was small in the natural environment and high in the manmade environment. B. Her ecological footprint was large in the natural environment (because she was the only human) and small in the man-made environment (because there are lots of humans). C. Her ecological footprint was the same in both environments because ecological footprints are only calculated over long (at least a year) periods of time for entire human populations. D. More information is needed about what resources the student used in both environments to determine her ecological footprint.
Beta-lactam drugs are only effective against growing bacteria
Indicate whether this statement is true or false.
Suppose you have engineered a plasmid vector in order to produce a functional animal protein in E. coli. But the product you collect, while it has the correct amino acid sequence, is in fact nonfunctional
What might you try that would have a greater chance of success? A) a eukaryotic expression vector that has sequences for regulating transcription B) using a host other than E. coli that does not have the same codon bias C) a eukaryotic expression vector that includes sequences for controlling posttranslational effects D) treatment of the posttranslation proteins to add signal sequences E) using yeast artificial chromosomes that can hold longer sequences
Which of the following describes a prezygotic barrier that could contribute to reproductive isolation?
a. A male moth lacks the specific sensory receptors for a pheromone produced by a female moth. b. Two grass varieties possess different mutant recessive alleles and offspring resulting from backcrossing with hybrids express more detrimental recessive traits. c. The offspring of crosses between lions and tigers cannot produce offspring themselves. d. Different salamander subspecies of a single genus produce offspring with each other, but these have shorter life spans than offspring of two parents within the same subspecies. e. None of the listed responses describe a postzygotic barrier.