Hummingbirds are attracted to red flowers with long tubes. What might you predict would happen to flowers if hummingbirds become the predominant species on a remote island?
A) Flowers would become gradually more red.
B) Flowers would develop shorter tubes.
C) Hummingbirds would develop longer beaks.
D) Hummingbirds would become extinct.
A
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The Modern Synthesis of evolution is based on
A. observations of the formation of new species. B. Darwin's ideas and modern concepts of genetics. C. experimental studies of populations performed by Darwin. D. recent concepts of adaptation and reproduction. E. recent developments of DNA replication and PCR machines.
To answer questions 76–80 refer to the four items listed below
a. cDNA b. restriction enzyme c. reverse transcriptase d. gene library M 76. This is from a viral source and catalyzes reactions to construct DNA strands from mRNA. M 77. This is any DNA made from mRNA transcripts. M 78. This is a nuclease whose only function is to cut apart foreign DNA entering a cell. M 79. These are collections of host cells that house cloned DNA. M 80. This is an enzyme used to produce cDNA.
When examining an electron micrograph of cells obtained from a new deep-sea life-form, you notice that the plasma membranes appear as two dark lines separated by a lightly stained region
Which of the following investigator(s) used a similar observation as the basis for a model of membrane structure? A) Robertson B) Gorter and Grendel C) Unwin and Henderson D) Overton E) Singer and Nicolson
The end of mitosis is determined by the end of which phase?
a. prophase b. metaphase c. anaphase d. telophase e. cytokinesis