Which of the following is not correct about birds?
A. Their feathers are derived from reptilian scales.
B. They have a low body temperature.
C. They have large breast muscles.
D. They have a fused collarbone.
E. They have thin, hollow bones.
Answer: B
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Several new tetraploid species of a plant called salsify (Tragopogon) known as salsify have arisen in western North America. These new species each arose from a diploid species that went through the process of allopolyploidy. This mode of speciation is a type of ________ and it occurs _______.
A. allopatric speciation; almost instantaneously B. allopatric speciation; very slowly C. sympatric speciation; almost instantaneously D. sympatric speciation; very slowly E. adaptive radiation; very slowly
Polymerase chain reaction (PCR) can be used to perform DNA sequencing reactions. In this case, are two primers (a forward and a reverse) necessary?
A. Yes-you can't perform PCR without two specific primers to amplify the region in question in the DNA. B. No-dideoxynucleotide sequencing depends on different length fragments being formed and then separated based on size. This can take place with only a specific forward OR a specific reverse primer. C. No-you actually need a primer pair for each round of DNA amplification ... so you'll need many, many primer pairs. D. Yes-and it will be important to make sure that the primer pairs are made with dideoxynucleotides that are labeled with fluorescent dyes. Otherwise, you won't be able to detect the fragments that are made in the PCR process.
Which environment would be most likely to harbor a biodiversity hotspot?
a. tropical island b. temperate grassland c. temperate deciduous forest d. desert e. savanna
The current extinction rate of vertebrates is 100–1,000 times the historical background. This is primarily due to
A. overharvesting. B. competition with exotic species. C. habitat destruction. D. competition with native species. E. random chance.