Which of the following is the most likely to be secreted into the renal tubule for excretion?
A) Water B) Excess Na+ C) Glucose D) Amino acids E) Vitamins
B
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In a tide pool, fifteen species of invertebrates were reduced to eight after one species was removed. The species removed was likely a(n) _____
A) pathogen B) keystone species C) herbivore D) resource partitioner E) mutualistic organism
Which animals develop with an organ made from maternal and embryonic tissues that allows the bloodstreams to transfer materials without mixing?
a. nonbird reptiles b. birds c. monotremes d. marsupials e. placentals
Cytokinesis in plant cells differs from cytokinesis in animal cells because
a. the contractile protein, actin, is important only in plant cells. b. a contractile ring forms only in plant cells. c. in plant cells, the cell plate must also divide into two parts. d. plant cells have a rigid cell wall. e. there is no difference.
Which of the following is the most difficult to treat with chemotherapeutic agents?
A) genital herpes B) gonorrhea C) syphilis D) trichomoniasis E) leptospirosis