Filtrate that is removed from the blood is collected
by the
a. loop of Henle.
b. glomerulus.
c. distal tubule.
d. proximal tubule.
e. Bowman’s capsule.
Answer: e
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Helper T cells secrete ____, which activate B cells and stimulate their proliferation
a. antigens b. allergens c. antibodies d. interferons e. interleukins
In eukaryotes, gene amplification is ________ and may occur when ________
A) the creation of multiple copies of the same gene; a large amount of the gene product is required for cell function B) a sudden increase in transcription of a gene; a large amount of the gene product is required for cell function C) a sudden increase in translation of a mRNA; a large amount of the gene product is required for cell function D) the creation of multiple copies of the same gene; transcription and translation are suppressed E) a sudden increase in transcription of a gene; translation is suppressed
Unlike most bony fishes, sharks maintain body fluids that are isoosmotic to seawater, so they are considered by many to be osmoconformers. Nonetheless, these sharks osmoregulate at least partially by _____
A) using their gills and kidneys to rid themselves of sea salts B) monitoring dehydration at the cellular level with special gated aquaporins C) tolerating high urea concentrations that are balanced with internal salt concentrations to seawater osmolarity D) synthesizing trimethylamine oxide, a chemical that binds and precipitates salts inside cells
pH7 solution is
a. acidic b. neutral c. basic