Which early scientist proposed that cells arise only from preexisting cells by a process of division?
a. Anton van Leeuwenhoek
b. Robert Brown
c. Matthias Schleiden
d. Theodor Schwann
e. Rudolf Virchow
E
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What mechanism is responsible for moving water in the xylem?
A. Respiration B. Digestion C. Photosynthesis D. Transpiration
After a period of intense physical activity, how long does it take for scorpion respiration rates to return to their initial values?
a. Less than 60 seconds b. Less than 30 minutes c. Approximately one hour
What is a proto-oncogene?
A. A gene that regulates cell division. D. A DNA repair gene. B. A cancer gene. E. More than one of these. C. A gene that encodes tumor-suppressing proteins.
What is one feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA?
a. They can only handle DNA fragments of up to 10 kb. b. They are an integral part of all eukaryotic cells. c. They contain no genetic material of their own so that the cloned fragment is truly isolated. d. The presence of genes that allow transformed cells to survive on different media. e. The base sequence of one strand reads the same as its complement