The cell nucleus likely originated from:
a. a mitochondrion. c. a bacteria.
b. an archaea. d. a eukaryote.
B
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Many birds, such as seagulls which rarely drink fresh water, deal with the osmotic stress of taking in large quantities
of salt in their food mainly by ____.
a. active transport of ions into the body through their feet b. excreting nitrogenous wastes through their kidneys as urea c. active transport of ions out of the body by chloride cells d. excreting excess salt through the actions of specialized salt glands in their heads e. maintaining high levels of urea and trimethylamine oxide in body fluids
Ruminants' stomachs have microbes to digest:
a. starch b. proteins c. cellulose d. lignin e. lipids
The extracellular matrix is composed mostly of
1.glycoproteins. 2.DNA. 3.RNA. 4.ribosomes. 5.lipids.
The following structure is largely impermeable to water and plays a role in concentrating urine.
A. Bowman’s capsule B. Renal medulla C. Distal tubule D. Ascending loop of Henle E. Descending loop of Henle