Consider a mother with normal vision who has a son with red-green color blindness. The mother was a "carrier" of the affected gene, as she had a normal phenotype but
A. two recessive alleles.
B. two dominant alleles.
C. one dominant and one recessive allele.
D. a codominant set of alleles.
E. an incompletely penetrating genotype.
C
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As the diaphragm contracts, the vertical dimensions of the thoracic cavity are decreased.
Answer the following statement true (T) or false (F)
How do the kidneys assist the skeletal, muscular, and nervous systems?
A. Excrete carbon dioxide B. Maintain blood vessel tone for blood pressure C. Convert vitamin D to its active form to absorb calcium from the digestive tract D. Produce renin and angiotensin converting enzymes
Which of the following is NOT an action needed for glutamate to open ion channels?
A. NMDA receptor must bind to glycine. B. Mg2+ is released from NMDA channel to open it. C. Cl- must pass through the open channel. D. The membrane must be partially depolarized from the action of a different neurotransmitter.
Which of the following statements is correct regarding net diffusion?
A) The greater the concentration gradient, the faster the rate. B) The lower the temperature, the faster the rate. C) The rate is independent of temperature. D) Molecular weight of a substance does not affect the rate.