Which statement is NOT true about echinoderms?
A. The exoskeleton is made of spiny plates.
B. Larvae are free-swimming and bilaterally symmetrical.
C. A water vascular system allows the tube feet to produce suction.
D. Gas exchange occurs through skin gills and tube feet.
E. Symmetry is radial in the adult, usually with parts in fives or multiples of five.
Answer: A
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Which one of the following would be the effect of salty environments on plants?
A. loss of water B. damage to membranes C. uptake of salt that causes toxicity D. water intake that causes turgid cells E. damage to plant proteins
Activators
A. are involved in negative control. B. are involved in positive control. C. always bind to the promoter. D. are allosteric proteins. E. are involved in positive control AND are allosteric proteins.
Which of the following is the main form of nitrogenous wastes released by aquatic invertebrates to
their environment?
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
Host mothering is technique important in in situ conservation
___________________ Indicate whether the statement is true or false.