Australopithecus was the first hominin to feature which distinguishing characteristic?
a. bipedalism
b. larger brains
c. shorter arms
d. sexual dimorphism
e. facultative bipedalism
d
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Two intermediates of the sterol biosynthesis pathway, isopentenyl diphosphate and dimethylallyl diphosphate, are used by archaea in the biosynthesis of ________.
A. isoprenoids B. hormones C. diacylglycerol D. nucleotides
Which appendages in chelicerae are used in place of antennae to provide tactile sensory information?
a. chelicerae b. ovigers c. pedipalps d. trochanter
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.
Viruses that infect bacteria are:
not known to exist. prions. bacteriophages. composed of only proteins. viroids. .