The genetic recombination of ________ caused massive, widespread epidemics that affected the global human population several times in the twentieth century
A) human and bacterial plasmids B) HIV and flu viruses
C) bacterial and viral plasmids D) bird flu viruses and human flu viruses
D
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The red blood cells of people with sickle cell anemia have abnormal shapes due to ____
a. hemoglobin molecules with mutant beta globin subunits sticking together and forming long fibers in the cytoplasm b. destruction of the hemoglobin molecules c. loss of hemoglobin through leaky cell membranes d. the attachment of phosphate groups to the hemoglobin molecules e. the binding of methyl groups to the heme group of the hemoglobin molecule causing desiccation of the cells
In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
A stem cell is a cell that
a. can differentiate into specialized cell types. b. has already differentiated. c. can develop into two or three cell types. d. can only develop into skin cells. e. can only develop into bone cells
Long term responses rather than immediate
behavioral responses are induced by a. alarm signals. b. signaling pheromones. c. sex attractants. d. priming pheromones. e. all of these.