Multicellular organisms with hard exoskeletons, segmented bodies and four pairs of jointed legs in the adult stage are

A) algae.
B) arachnids.
C) insects.
D) helminths.
E) lice.


B

Biology & Microbiology

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Examine Figure 23.2 in your textbook. The group "fish" includes all vertebrates except the tetrapods. The taxon "fish" is therefore a _____ group

A. monophyletic B. paraphyletic C. polyphyletic

Biology & Microbiology

Is it possible to be a "carrier" (phenotypically normal but capable of passing the allele to one's offspring) for a genetic disease exhibiting this type of inheritance?

a. Yes b. No

Biology & Microbiology

Holoprosencephaly is a highly variable condition in mammals, including humans. Its effects range from an absence of brain areas, mid-face disorders, and cyclopia to slight dental abnormalities. One form, HPE3, is caused by Shh mutations

Familial cases are inherited as dominants. Which of the following do you expect? A) HPE3 is actually a multigene complex. B) Each type of malformation is due to a different HPE3 allele. C) HPE3 expression is modified by genetic background. D) HPE3 individuals also share a common environmental exposure. E) All mutations in Shh that result in HPE3 are due to frameshifts.

Biology & Microbiology

When Pavlov's dog salivated after hearing a bell, this exemplified

A. classical conditioning. B. operant conditioning. C. habituation. D. nonassociative learning.

Biology & Microbiology