A key trait that distinguishes gnathostomes from other chordate lineages is the presence of

a. bony scales.
b. claspers.
c. jaws.
d. the operculum.
e. keratin.


C

Biology & Microbiology

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Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?

A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.





A) 1
B) 2
C) 3
D) 4

Biology & Microbiology

Which of the following drugs acts to block reuptake of neurotransmitters?

1.aspirin 2.acetylcholine 3.Prozac 4.Ecstasy 5.Prozac and Ecstasy

Biology & Microbiology

A callus is a mass of bone and cartilage that

A) is a form of bone cancer. B) thickens the fibrous structure of a muscle. C) forms after a bone breaks. D) is involved in bone formation in the vertebrate embryo.

Biology & Microbiology

Bt corn is a genetically engineered plant. What feature gives it value as a crop plant?

A) The plant produces a toxin designed to kill monarch butterflies. B) The plant produces a toxin designed to kill corn borers. C) The plant produces a toxin designed to kill competing plants (also known as weeds). D) The plant grows significantly larger ears of corn. E) The plant produces better-tasting kernels of corn.

Biology & Microbiology