A connective tissue differs from an epithelial tissue in that connective tissue
A) is composed of cells supported by a basement membrane.
B) can produce and secrete products into the bloodstream.
C) is composed of cells that can be described as squamous or cuboidal.
D) is composed primarily of a nonliving extracellular material, which is located between the cells.
E) is composed of cells interconnected by gap junctions or adhesion junctions.
D
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Small RNA molecules (20—30 nucleotides in length) that have recently been found to have biological function include
A) microRNAs (miRNA). B) silencing RNAs (siRNA). C) messaging RNAs (mRNA). D) both choices A and C E) all of the above
Along with the Earth's rotation, winds have a large influence on ocean currents. Periodic strengthening or weakening of winds can therefore result in dramatic changes to marine and terrestrial ecosystems. El Ninõ is a periodic weakening of the trade winds that normally drive the South Equatorial Current and the Humboldt Current. The weakening of these trade winds during an El Ninõ event slows down or stops the Humboldt Current. What would occur as a result of an El Ninõ event? Check all that apply.
_____ The ocean waters off the west coast of South America would become warmer. _____ Most marine species off the coast of South America would experience rapid population growth. _____ Fisheries that operate off the coast of South America would see declining catches for some species. _____ The ocean water off the coast of South America would become colder.
If its cells are striated and fused at the ends so that the cells contract as a unit, the tissue is:
a. smooth muscle b. dense fibrous connective c. supportive connective d. cardiac muscle e. skeletal muscle
Which of the following was propagated and promoted for use by the Soil Conservation Service but is now listed as a Federal Noxious Weed?
A) purple loosestrife B) Australian paperbark tree C) kudzu D) evening primrose