Hybrid inviability occurs when two species mate and produce fertile offspring
Indicate whether the statement is true or false
FALSE
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In regions of a chromosome that encode highly structured RNA molecules, what sequence characteristics would you expect to find?
A. an abundance of pyrimidines, which play an important role in three-dimensional folding of RNA B. an abundance of uracil, which plays an important role in three-dimensional folding of RNA. C. multiple short segments capable of base pairing with adjacent or distant regions of the sequence. D. heavy methylation of these gene sequences, preventing their expression E. very little in the way of sequences that can form double-stranded helices
What is the term for the estimated total availability of organic matter for food?
a. annual biomass production b. above-ground biomass c. net primary productivity d. gross biomass volume
As population density increases in harp seals (Phoca groenlandica), females
A) become sexually mature at a smaller body size. B) refuse to mate with males. C) begin reproduction at a later age. D) often cannibalize their own offspring.
Echinoderms include _______.
a) insects and crustaceans b) tapeworms and planarians c) jellyfish and sea anemones d) snails, clams, and squids e) starfish and sea urchins