During a malaria infection, Plasmodium falciparum grow inside of human cells as
A. autotrophs.
B. heterotrophs.
C. phototrophs.
D. heterotrophs and autotrophs.
E. autotrophs and phototrophs.
Answer: B. heterotrophs.
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Why was it informative for researchers to study the proximate causation of Daphnia switching reproductive tactics in the laboratory?
A) Daphnia in the wild were genetically identical and the laboratory was the only place where Daphnia would reproduce sexually. B) Daphnia could not obtain enough energy in the wild to reproduce sexually. C) Daphnia were no longer available in the wild when the investigations occurred. D) Daphnia were never under high crowding conditions in the wild.
Structurally similar RTKs have been found in all multicellular animals, suggesting that ____
a. RTK genes are resistant to mutation b. RTKs evolved relatively early in the history of animals c. RTKs evolved from G proteins d. RTKs are not involved in vital processes in animals e. RTKs have evolved independently of each other in animals
How many possible orientations are there if a cell has four chromosome pairs?
A. 4 B. 8 C. 16 D. 32 E. It is impossible to determine.
A hormone released in the small intestine that stimulates the pancreas to release digestive enzymes and the gallbladder to release bile is known as ________
A) cholecystokinin B) secretin C) gastrin D) vasoactive intestinal peptide