Secretion of GnRH is inhibited by all EXCEPT
a. secretions from Sertoli cells.
b. elevated testosterone levels.
c. secretion of inhibin.
d. normal sperm production.
e. secretions from Leydig cells.
Answer: d
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As you are analyzing the blood sample of a human patient, you note an abnormally high number of erythrocytes. Predict the effects of this situation.
A. Less oxygen would reach the tissues. B. More nutrients would reach cells. C. Immune function would improve. D. The ease of flow for the blood could decrease.
A slipper limpet can change its sex from female to male
Indicate whether the statement is true or false.
Sister chromatids separate during which phase of meiosis?
a. prophase I b. prophase II c. anaphase I d. anaphase II
Various modifications in leaves can make plants better adapted to their habitats. Which of the following is not an evolutionary modification of leaves?
A. floral leaves B. fruit-bearing leaves C. reproductive leaves D. spines E. insectivorous leaves