Which of the following structures does not enter or exit the kidney at the hilum?

A) The renal column
B) The renal artery
C) The ureter
D) The renal vein
E) All of these structures enter or exit the kidney at the hilum.

Which structure of the hair follicle supplies the capillaries that provide the growing hair with oxygen and nutrients?

A) Hair papilla
B) Hair root
C) Hair shaft
D) Hair matrix
E) Hair bulb

Ribosomes are composed of

A) DNA and RNA.
B) DNA and protein.
C) only protein.
D) RNA and protein.
E) only DNA.