Which lineage of Cnidarians exist only as polyps as adults, build calcium carbonate exoskeletons, and have a mutualistic relationship with photosynthetic protists?
a. Scyphozoa
b. Anthozoa
c. Cubozoa
d. Hydrozoa
Ans: b. Anthozoa
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The leaves of ginkgo trees have:
A. unbranched veins B. forked veins C. multiply branching veins D. veins in a netlike pattern E. veins only around the edges
The hormone that is the basis of most pregnancy tests is
A. follicle-stimulating hormone. B. luteinizing hormone. C. human chorionic gonadotropin. D. estrogen. E. progesterone.
How are the two chromosomes separated and distributed to the two ends of the cell during prokaryotic cell division?
a. by an unknown mechanism b. by attachment to separating membrane regions c. by attachment to actin d. by the action of the mitotic spindle
Embryonic induction, the influence of one group of cells on another group of cells, plays a critical role in embryonic development
In 1924, Hans Spemann and Hilde Mangold transplanted a piece of tissue that influences the formation of the notochord and neural tube, from the dorsal lip of an amphibian embryo to the ventral side of another amphibian embryo. If embryonic induction occurred, which of the following observations justifies the claim of embryonic induction? A) The transplanted tissue induced multiple limbs to develop on the ventral side of the recipient embryo. B) The transplanted tissue inhibited normal cell division on the dorsal side of the recipient embryo that lead to its death. C) The transplanted tissue had no effect on either the ventral or dorsal side of the recipient embryo so it continued to develop normally. D) The transplanted tissue induced the formation of a second notochord and neural tube on the ventral side of the developing embryo.