A patient at a fertility clinic has been diagnosed with “luteal phase defect” (LPD). Her progesterone levels are low and her cycles are short. What step of reproduction are these symptoms disrupting?
A.
Follicle development
B.
Ovulation
C.
Fertilization of the egg
D.
Implantation
D.
Implantation
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What will be an ideal response?
Persons infected with HIV often die of opportunistic diseases because
A. HIV can transduce other viruses into virulent strains. B. HIV destroys T cells. C. HIV binds to antibodies. D. HIV is a retrovirus. E. HIV mutates easily.
Approximately how many genes are present in the human genome?
A) 3 billion genes B) 20 billion genes C) 100,000 genes D) 20,000 genes E) 50,000 genes
The process of reabsorption in the formation of urine ensures that __________.
a. excess H+ is removed from the blood b. drugs and toxins are removed from the blood c. urine is always hyperosmotic to the interstitial fluid d. pH is maintained by balancing H+ and HCO3- e. glucose, salts, and water are returned to the blood