A man is taking a prescription blood thinner. His doctor informs him that if he sustains a minor injury, he needs to take vitamin K supplements to help prevent excessive bleeding and related complications. Why would vitamin K be required in this situation?
A. Vitamin K is used to make hemoglobin.
B. Vitamin K is essential for the synthesis of prothrombin.
C. Vitamin K is required for leukocyte function in immunity.
D. Vitamin K is a clotting factor.
Answer: B
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A researcher engineers a deletion in the genome of sperm cell DNA that inhibits production of an enzyme in the sperm cell membrane. The researcher then adds the sperm to a culture dish with a secondary oocyte, along with chemicals to guide the sperm to the oocyte. Upon observation, it is found that the sperm fails to penetrate the corona radiata of the oocyte. What enzyme has been deleted from the sperm membrane?
A. Juno B. Catalase C. Acetylcholinesterase D. Hyaluronidase
Sperm are ejaculated from the corpora cavernosa of the penis
Indicate whether the statement is true or false
Having to adjust to a dark room after walking in from bright light is because:
A) rhodopsin does not function in dim light. B) rods exposed to bright light need time to regenerate rhodopsin. C) the lens requires time to accommodate dim light. D) only cones function in dim light.
What is residual volume?
A. Residual volume is the amount of air that an individual can maximally inhale after a normal inhalation. B. Residual volume is the amount of air left in the lungs after a normal exhalation. C. Residual volume is the amount of air that an individual can maximally exhale after a normal expiration. D. Residual volume is the amount of air left in the lungs after a maximal exhalation