If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?
A) The cells remain unchanged due to equal solute concentrations inside and outside the cells.
B) The cells remain unchanged due to equal water concentrations inside and outside the cells.
C) They become white blood cells.
D) The cells swell and burst because water moves into them.
E) The cells shrivel up because water leaves them.
E
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The process of in situ hybridization is used for which of the following?
A. Cytogenetic mapping B. Physical mapping C. Linkage mapping
In your fertility clinic, you look at the lab results of a young man. He has a prostate gland the size of a golf ball, a fructose-rich semen, and 10 million sperm per ml. His sperm consist of little more than DNA, mitochondria, and a flagellum, with almost no cytoplasm. Also, he has follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in his bloodstream. Which of these is the likely cause of his fertility problems?
A. FSH and LH B. Enlarged prostate gland C. Fructose in the semen D. Sperm morphology E. Sperm count
Calvin Bridges, an associate of Thomas Hunt Morgan's, found further evidence that genes were located on chromosomes. Which of the following is not a component of his study?
A. He crossed white-eyed females (XwXw) with red-eyed males (XWY). B. The F1 progeny were mostly the red-eyed males and white-eyed females expected. C. A few rare white-eyed females and red-eyed males were observed, which he called primary exceptionals. D. He proposed that the rare white-eyed females were the result of abnormal chromosome number. E. Abnormal chromosome number was a result of nondisjunction in the female fly.
Which of the following can make it easier to see the internal parts of a cell through a light microscope?
a. Beams of electrons b. Stronger lenses c. Direct source of natural light d. Special stains