Which subphylum includes members that are now all extinct, but which were once extremely numerous in shallow Paleozoic seas?
a. Crustacea
b. Trilobita
c. Hexapoda
d. Myriapoda
Ans: b. Trilobita
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Continued stimulation of a receptor may lead to a diminished response and is called __________. Fill in the blank(s) with the appropriate word(s)
The organism shown here lives in
a. tropical seas. b. cool oceans. c. freshwater lakes and rivers. d. temperate forests. e. wetlands.
Mice have a set of multiple alleles of a gene for coat color
Four of those alleles are as follows: C = full color (wild) cch = chinchilla cd = dilution c = albino Given that the gene locus is not sex-linked and that each allele is dominant to those lower in the list, diagram the crosses indicated below and give the phenotypic ratios expected from each. (a) wild (heterozygous for dilution) × chinchilla (heterozygous for albino) (b) chinchilla (heterozygous for albino) × albino
Which of the following has bacteriochlorophylls and uses alcohols for carbon?
A) chemoautotroph B) chemoheterotroph C) photoautotroph D) photoheterotroph