What is a negative feedback loop? How does this apply to sperm production?
What will be an ideal response?
A negative feedback loop is used to maintain a constant level of testosterone through an opposing mechanism. The brain secretes LH and FSH, this travels to the testes causing the production of sperm and testosterone. When the testosterone level gets too high, it blocks the production of LH and FSH causing a decline in production of sperm and testosterone. When ejaculation occurs, the testosterone level drops and the cycle begins again.
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The functional unit of the kidney is the
(a) renal pelvis. (b) ureter. (c) cortex. (d) nephron.
Applying a chemical to the surface of the laboratory bench to remove the contaminating microorganisms is considered:
a. sterilization. b. disinfection. c. decontamination. d. pasteurization.
Which organelle contains cristae where enzymes and electron carriers for aerobic respiration are found?
A. Lysosome B. Chloroplast C. Mitochondrion D. Golgi apparatus E. Endoplasmic reticulum
Identify the major technique that refers to placement of bacteria into a medium such as broth, blood, or a fertilized egg in order to facilitate growth.
A) isolation B) inspection C) inoculation D) identification