In humans red-green color blindness is a sex-linked recessive trait. If a man and a women produce a color-blind son, which of the following must be true?
A. The father is color-blind
B. Both parents carry the allele for color blindness
C. Neither parent carries the allele for color blindness
D. The father carries the allele for color blindness
E. The mother carries the allele for color blindness
Ans: E. The mother carries the allele for color blindness
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In mammals and some reptiles, the coelom is divided into smaller cavities that enclose the lungs, heart, and gut. What are these cavities called?
A. pleural, pericardial, and peritoneal cavities B. thoracic, pleural, and pericardial cavities C. pleural, pericardial, and cardial cavities D. perithoracic, peritoneal, and pericardial cavities
What is the concept illustrated by the experiment in the accompanying figure?
a. Protein is not the encoding material. b. Protein cannot enter the host cell. c. Protein renatures due to radiation. d. Protein is composed of subunits with phosphate. e. Protein is composed of subunits with sulfur.
Chlorine and ethylene oxide are sterilizing gases.
Answer the following statement true (T) or false (F)
MSG is often used as a seasoning to enhance the flavors of meat, fish, and vegetables. Which type of taste receptor cell responds to MSG?
A) Bitter B) Sweet C) Umami D) Salty E) Sour