Which of the following statements does NOT correctly describe differences between larval and adult tunicates?
A. Larval tunicates have a conspicuous notochord that is lost by the time they become adults.
B. Larval tunicates have a hollow dorsal nerve cord that is reduced to only a ganglion in the adult.
C. The tail of the larval tunicate is lost by the time it transforms into an adult.
D. The pharynx of the larval tunicate becomes more prominent in the adult.
E. The larval tunicate lacks an incurrent and excurrent siphon but the adult has both structures.
E. The larval tunicate lacks an incurrent and excurrent siphon but the adult has both structures.
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Most species of ctenophore are:
a. haploid. b. male or female only. c. hermaphroditic. d. asexual. e. none of the above
Tubular secretion occurs in the region labeled
a. 1. b. 2. c. 3. d. 4. e. as none of these.
Which hormone is detected in a pregnancy test?
A) human chorionic gonadotropin hormone made by the early embryo B) progesterone made by the corpus luteum C) luteinizing hormone made by the pituitary D) estrogen made by the ovary
The smooth ER is the primary site for the synthesis of phospholipids and cholesterol needed to make ____
a. DNA b. ATP c. ribosomes d. hormones e. cell membranes