Which structures are responsible for removing introns from the primary RNA transcript in eukaryotes?
a. exosomes
b. ribosomes
c. spliceosomes
d. lysosomes
c. spliceosomes
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In the 1940's, biologist Adolph Murie studied survival in Dall sheep in what is now Mount Danali National Park in Alaska
He found that Dall sheep that survive their first year of life have a high probability of surviving until they are around 9 years old; after that, they rapidly become easy prey for wolves and die at a very high rate. This pattern best fits a type ____ survivorship curve. Fill in the blank with the appropriate word.
Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
The release of factors by cells that influence the activity of nearby cells is referred to as:
A. autocrine signaling. B. paracrine signaling. C. pheromonal signaling. D. electrical signaling. E. endocrine signaling.
Which of the following parasites is the major parasitic cause of deaths worldwide, yet its transmission could be prevented by access to clean water?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica