Which statement is not true about invertebrate animals?
A. The vast majority of animal species are invertebrates.
B. Many invertebrate species live in a marine environment.
C. Most animal phyla are invertebrates.
D. All major invertebrate groups arose from protistan ancestors.
E. Invertebrates lack a nervous system.
Ans: E. Invertebrates lack a nervous system.
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Osmoconforming sharks take in water, as needed, _____
A) by migrating to freshwater rivers to drink fresh water B) via osmosis, as their body cells are slightly hyperosmotic to seawater C) via active transport of water across the cells on their gills D) by water diffusion from seawater, which is hyperosmotic to the fluids in their cells E) by selective transport of water molecules across the wall of the gut
A third mutant allele of gene B (allele b3) causes the frogs' eyes to become green, instead of their normal red color. Normally, gene B effects only skin color. What term describes this allele?
A) Hypermorphic B) Neomorphic C) Hypomorphic D) Amorphic E) Haploinsufficient
Archaeons have been isolated from both temperate and cold environments.
Answer the following statement true (T) or false (F)
In an experiment, the group used as a basis of comparison is the
A. control group. B. experimental group. C. empirical group. D. variable group.