Which of the following correctly describes the path of urine from formation to excretion in the mammalian kidney?
A. collecting duct ? renal pelvis ? ureter ? urinary bladder ? urethra
B. renal pelvis ? ureter ? urinary bladder ? urethra ? collecting duct
C. ureter ? collecting duct ? renal pelvis ? urinary bladder ? urethra
D. collecting duct ? ureter ? urinary bladder ? renal pelvis ? urethra
E. urethra ? collecting duct ? renal pelvis ? ureter ? urinary bladder
A. collecting duct ? renal pelvis ? ureter ? urinary bladder ? urethra
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The oldest plant community in Glacier Bay is hemlock-spruce forest. You would predict that hemlock and spruce trees are _____-selected species
A. r B. K
The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?
A. Calcium movement involves the use of a pump. B. Calcium movement involves active transport. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement requires energy. E. Calcium movement occurs through a transmembrane protein.
DNA is
a. composed of protein and lipid subunits. b. organized into functional units called genes. c. organized into functional units called chromosomes. d. organized into functional units called ribosomes. e. organized from information contained in proteins.
Which mammalian feature aids in both thermoregulation and communication?
a. sudoriferous glands b. sebaceous glands c. permeable skin d. vibrissae