The structure labeled A in Figure 27-1 is a:
a. gametangium of an alga.
b. gametangium of a plant.
c. germinating spore.
d. megasporangium of an alga.
e. megasporangium of a plant.
A
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What does an organism need to be classified as Lophotrochozoa?
a. a set of ciliated tentacles around the mouth b. free-swimming larvae with two bands of cilia c. triploblastic germ layers and bilateral symmetry d. a fully formed true coelom lined by mesoderm
The main regulator of calcium blood levels is the ____
a. parathyroid glands b. thyroid glands c. hypothalamus d. anterior pituitary gland e. posterior pituitary gland
Which of the following cell cycles is represented by birds?
A) Alternation of generations B) Haploid life cycle C) Diploid life cycle
Which of the following is characteristic of a eukaryotic ribosome?
A) it contains rRNA B) it consists of large and small subunits C) it functions only to translate mRNA D) all of the choices