What term describes the characteristic of a plasma membrane that allows only certain materials to cross?
What will be an ideal response?
The term is "selectively permeable.".
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Which of the following represents the correct sequence of cell types through which an electrical signal would pass in a reflex arc?
A. sensory neuron ? interneuron in the CNS ? motor neuron B. motor neuron ? interneuron in the PNS ? sensory neuron C. sensory neuron ? motor neuron ? interneuron in the CNS D. motor neuron ? sensory neuron ? interneuron in the PNS E. sensory neuron ? motor neuron ? interneuron in the CNS
A cross is performed between parents with genotypes aaBbCc and aaBbcc. What is the probability that the offspring
will have the same genotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.
a. 1/8 b. 1/4 c. 3/8 d. 3/16 e. 9/16
This autosomal dominant genetic trait is associated with a gene on human chromosome 4 and causes a type of
dwarfing due to defective cartilage formation.
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
The characteristic of water that allows water to be moved from plant roots to leaves is maintained by:
What will be an ideal response?