Polydactyly is expressed when an individual has extra fingers and/or toes. Assume that a man with six fingers on each hand and six toes on each foot marries a woman with a normal number of digits. Having extra digits is caused by a dominant allele
The couple has a son with normal hands and feet, but the couple's second child has extra digits. What is the probability that their next child will have polydactyly?
A) 7/16 B) 3/4 C) 1/8 D) 1/2 E) 1/32
D
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The ?-jelly roll of the Lpt system functions to
A. help translocate assembled LPS across the outer membrane of the bacterial cell. B. help attach the O-antigen to core oligosaccharide moieties during synthesis of LPS. C. help anchor the newly positioned LPS on the bacterial cell surface. D. help hide lipid A from the hydrophilic periplasm during LPS transport to the membrane.
The synaptic cleft is
A. a deep furrow in a postsynaptic cell where signals are received. B. specialized channels in the presynaptic membrane that allow the passage of ions. C. the narrow extracellular space between the presynaptic and postsynaptic neurons at the synapse. D. recesses in the postsynaptic neuron membrane where neurotransmitters bind. E. the area of neuronal membrane between the dendrites and the axon hillock.
Select all of the body organs that are connected to the respiratory system in the region of the pharynx and nasal cavity.
A) Esophagus B) Skeletal system C) Nose D) Ears
The free-swimming adult stage of many cnidarians that reproduces sexually is a
A. larva. B. polyp. C. medusa. D. zygote.