29)What is the main nitrogenous waste excreted by birds?
a)ammonia
b)uric acid
c)nitrite
d)urea
e) nitrate
Which organism(s) has excretory organs known as Malpighian tubules?
a)flatworms
b)insects
c)jellyfish
d)earthworms
e) both a and b
31) What is the functional unit of the kidney
a)bladder
b( glomerulus
c) vasa recta
d) nephron
e)cortex
Which part of the vertebrate nephron consists of capillaries?
a) collecting duct
b)loop of Henle
c) bowman's capsule
d) distal tubule
e) glomerulus
Which of the following processes of osmoregulation by the kidney is the least selective?
a) H+ pumping to control pH
b) secretion
c) salt pumping to control osmolarity
d) filtration
e) reabsorption
Any help on these would be greatly apperciated..thanks this is the hardest subject for me. Yes I read the chap several times but for some reason its not sticking! Thanks again
2007-03-31 12:57:41 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology