Water enters the water vascular system of echinoderms through the:
a. spines.
b. mouth.
c. madreporite.
d. tubercle.
e. tube feet.
C
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Which of the following signalling proteins is specifically associated with development in animals?
A) Hedgehog B) Zbtb7 C) Ryanodine D) calcium-dependent protein phosphorylases E) protein kinase A
The letter "C" above represents
a. uterus. b. ovary. c. vagina. d. urinary bladder. e. pelvic girdle
What type of test would you use to determine whether observed data constitute evidence of genetic linkage or are simply a case of chance variation from expected values?
A) test cross B) two-point test cross C) three-point test cross D) chi-square analysis E) recombination frequency (r) calculation
Most mollusks are:A
found in fresh water. B. marine. C. terrestrial. D. arboreal. E. parasitic.