Which of the following is a diagnostic feature that
forms the basis for classification of sea squirts as
chordates?
a. metamorphosis from a motile larva to a sessile
adult
b. a heart that allows circulation of blood
c. a notochord located in the tail of the larva
d. sexual reproduction during the larval stage
e. the presence of a tunic or coat over the body of
the adult
Answer: c
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Bacteria that are able to grow in humans and cause disease have likely evolved to be
A) psychrophiles. B) mesophiles. C) thermophiles. D) hyperthermophiles.
We have a family of genes that code for different forms of myosin. How different do you think these gene sequences are from each other?
A. completely different, no identical base sequences B. completely the same, identical base sequence C. some differences in sequence, some similarities
A graph of phenotypic variation similar to the
illustration above strongly suggests a. incomplete dominance. b. codominance. c. epistasis. d. polygenic inheritance. e. environmental effects on phenotype
In a pond ecosystem, a crayfish feeds on three species of algae. It is in turn preyed upon by one species of fish and a heron. The heron also preys upon the fish. What is the minimum number of food chains in this food web?
A. 2 B. 3 C. 4 D. 5 E. 6