A farmer in Vermont is going to tap a tree in order to make maple syrup. Which of the following plant structures must the farmer break to release (and collect) the sugar-rich base for his syrup?
A. phloem
B. xylem
C. cuticle
A
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Once a prion enters a nerve cell, it essentially
A) assumes the correct folding orientation for the protein. B) stops the cascade of misfolding events associated with adjacent cells. C) becomes self-propagating, causing misfolding of nearby normal proteins. D) differentiates into a nonreplicating virus. E) differentiates into a replicating virus.
This is the process a cell goes through to become a particular cell type, based on the proteins that it expresses and is more-or-less a permanent condition.
A. differentiation B. somatic cell transfer C. discrimination D. determination
The roots of about 10% of all kinds of plants are involved in symbiotic associations with certain kinds of fungi.
Answer the following statement true (T) or false (F)
Which type of connective tissue holds bones together?
A. Tendons B. Intercellular junctions C. Ligaments D. Cartilage E. Collagen