Infection with the Ebola virus is characterized by:
A) a progressive onset of high fever.
B) internal and external hemorrhage.
C) the formation of cutaneous blisters.
D) paralysis of the respiratory muscles.
Answer: B) internal and external hemorrhage.
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The rapid increase in adaptive immunity after a second antigen exposure is called
A) immune memory. B) specificity. C) tolerance. D) immune memory, specificity, or tolerance.
Which of the following occurs in both spermatogenesis and oogenesis?
A. Diploid stem cells divide by mitosis to create a large population of precursor cells. B. The developing gametes remain connected to one another via cytoplasmic bridges. C. Polar bodies are produced. D. Four haploid gametes are produced. E. Production of gametes begins at puberty.
The production of red blood cells is regulated by a feedback loop involving erythropoietin. In non-disease states, the production of red blood cells is equal to the destruction of red blood cells, thus maintaining sufficient red blood cells to deliver adequate oxygen to the body's tissues. However, when the number of red blood cells decrease and oxygen levels are low, erythropoietin is produced by the liver and kidneys to increase the production of red blood cells. Is this a positive or negative feedback loop? Explain your answer.
What will be an ideal response?
Activity of CDKs is mediated by:
a. cyclins b. checkpoints c. growth factors d. nuclear lamins e. receptors