White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?
A) Mix the blood in a salty solution to cause the RBCs to lyse.
B) Mix the blood in an isotonic solution and allow the WBCs to float to the top.
C) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse.
D) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse.
Answer: C
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Transcription factors control which of the following phases of pattern formation in the human embryo?
A. formation of body axes and segmentation B. segmentation and development of segment characteristics C. segmentation, development of segment characteristics, and cell differentiation D. formation of body axes, segmentation, development of segment characteristics, and cell differentiation E. cell differentiation
Describe some of the advantages of segmentation
What will be an ideal response?
Animals that maintain internal body temperature using heat generated by their own metabolism are called
A) endotherms. B) ectotherms. C) reptiles. D) amphibians.
A middle-aged female patient complains of changes to her face. Her cheekbones and eyebrows have become more prominent, and her jaw is growing. You suspect acromegaly, a disorder caused by excessive growth hormone. She had no growth abnormalities in her youth. What do you suspect is the most likely cause of her problem?
A. A tumour of the pineal gland B. A tumour of the anterior pituitary C. Menopause D. Congenital mutation of the GH regulatory region E. A tumour of the posterior pituitary