What actually happens to the blood cells of people with sickle cell anemia that causes the cells to
change their shape ("sickle")?
A. Polymerization of hemoglobin molecules into long fibers.
B. Destruction of the hemoglobin molecules.
C. Loss of hemoglobin through leaky cell membranes.
D. Attachment of phosphate groups to the hemoglobin molecules.
E. Binding of methyl groups to the heme group of the hemoglobin molecule.
A
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Some intracellular pathogens produce phagocyte-killing proteins called ________ that kill the phagocyte after ingestion of the pathogen
A) antibodies B) antigens C) leukocidins D) pus
Which of the following is NOT an example of a mechanoreceptor?
A. Meissner's corpuscles B. Ruffini endings C. Merkel cells D. red corpuscles E. Pacinian corpuscles
The energy that excites the photosystems is supplied by
A) electrons passing down the electron transport chain. B) ATP. C) photons. D) NADPH.
The cloning of Dolly the sheep
A) demonstrated that the nuclei from differentiated mammalian cells can retain their full genetic potential. B) demonstrated that differentiated cells contain only a fraction of their full genetic potential. C) demonstrated, for the first time, that eggs are haploid and body cells are diploid. D) revealed that cloned mammals most resemble the egg donor.