Prokaryotes are very important ecologically because of their involvement in all of the following except
A. STDs.
B. denitrification.
C. photosynthesis.
D. nitrogen fixation.
E. bioremediation.
Answer: A
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A pharmaceutical company develops a drug inhibiting mitosis of sporozoites in an effort to prevent malaria. How would this affect the next step of the infection cycle of Plasmodium falciparum?
A. Merozoites would not be produced. B. Gametocytes would not be produced. C. Gametes would not be produced. D. Infected red blood cells would not attach to the linings of capillaries. E. Infected red blood cells would not burst.
David Jablonski and colleagues found that species of bivalves with which of the following trait(s) persisted longer, and were less likely to die out, during times of background extinction?
A) epifaunal, suspension-feeding lifestyle B) wider geographic ranges C) planktonic larval stages D) All of the above. E) None of the above.
An operon is defined as:
a. a group of structural genes, with no regulatory sequences. b. regulatory sequences upstream of a structural gene. c. a group of related structural genes, plus their associated regulatory sequences. d. one structural gene plus one regulatory gene. e. a group of unrelated structural genes, plus their associated regulatory sequences.
Select all of the factors that influence enzyme speed.
A) pH B) Temperature C) Availability of Cofactors D) Amount of enzyme lost in the reaction