What is true of normal urine production?IBlood pressure is used to push nitrogenous waste, water, and small molecules through a filter, forming the filtrate, while cells and most proteins are retained in the blood.IIMost water is reabsorbed as the filtrate is passing through a long tube.IIIAll the urea that enters a kidney nephron is excreted.
A. II and III
B. Just I
C. Just II
D. I and II
E. I, II, and III
Answer: D
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Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a
A. neurogenic heart while vertebrates have a myogenic heart. B. myogenic heart while vertebrates have a neurogenic heart. C. neurogenic heart while vertebrates have a cardiogenic heart. D. cardiogenic heart while vertebrates have a myogenic heart. E. autonomous heart while vertebrates have a neurally controlled heart.
The ____ is a protective structure where sperm cells are formed in bryophytes and some other plants
a. antheridium b. stoma c. strobilus d. sporangium e. archegonium
Enzymes used to cut DNA molecules in recombinant DNA research are
a. ligases. b. restriction enzymes. c. transcriptases. d. DNA polymerases. e. replicases.
Infectious naked strands of RNA are called
A. oncogenic viruses. B. prions. C. viroids. D. phages. E. spikes.