Describe what caused the extinction of dodo birds. What will be an ideal response?
ANSWER: The dodo was a big, flightless bird that lived on the island of Mauritius in the Indian Ocean.
Dodos were plentiful in 1600, when Dutch sailors first arrived on the island, but 80 or so
years later the birds were extinct. Sailors ate some, but destruction of nests and habitat by
rats, cats, and pigs introduced by the sailors probably had a greater effect.
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A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
Which of the following organisms has a pattern of gastrulation that is the most similar to humans?
a. amphibians b. birds c. drosophila d. sea urchin e. zebra fish
Which of the following is NOT true about
crossing over of meiosis?
a. genes between homologous chromosomes are exchanged b. it can occur at any location along the chromosomes c. it is more frequent in some regions of the chromosome than others d. it results in genetic similarities e. when they cross over, homologous chromosomes are in a condensed state
A typical human body has ____ bones
a. 78 b. 168 c. 206 d. 417 e. over 600