The conclusion that early hominins were bipedal is based in part on examination of four of the following. Which one is the exception?
A. Their S-shaped backbone
B. The position of the opening for the spinal cord in the skull
C. Footprints
D. Their jaw shape
E. Length of the femur
Answer: D
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Which respiratory surface lacks physical protection from the external environment?
a. tracheal system tubes b. human lungs c. external gills d. internal gills e. bird lungs
Heterotrophs must obtain organic molecules that have been synthesized by
A. biogeochemical cycles. B. bacteria. C. decomposers. D. autotrophs.
Multiple sclerosis is brought about by
a. destruction of cells in the basal ganglia. b. a viral infection of the meninges. c. a buildup of amyloid protein in the brain. d. CSF buildup in the ventricles. e. progressive destruction of the myelin sheath in the CNS.
In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog
A. has the genotype dd. B. is still of unknown genotype since there were offspring of both deaf and hearing phenotypes. C. has the genotype DD. D. is actually deaf. E. has the genotype Dd.