Normally, concentrations of wastes, such as urea, are
Select one:
a. high in urine in comparison to plasma.
b. high in the filtrate but low in urine.
c. in trace amounts in urine but are high in blood.
d. not in the filtrate but are present in low concentrations in the urine.
e. only found in the excretory organs where they originate from metabolism.
a. high in urine in comparison to plasma.
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Refer to the accompanying figure. What is the structure labeled as 9?
a. medusa
b. planula
c. miracidium
d. feeding polyp
e. polyp colony
X chromosome inactivation results in the _______________________.
A. total inactivation of both X chromosomes B. inactivation of only the paternal X chromosome C. inactivation of only the maternal X chromosome D. inactivation of either the paternal X chromosome or the maternal X chromosome E. nonrandom inactivation of X chromosomes in the initial cells of tissues
Muscles can carry out their unique motor function because they are the only cells which contain actin and myosin.
Answer the following statement true (T) or false (F)
_________ is a temporary storage site for enzymes released by the cell membrane.