A man was under treatment for infertility. Examination of his sperm showed that his sperm could not swim. He also suffered from chronic bronchitis and other respiratory problems in which mucus with trapped particles was not being cleared from his lungs
From this you might infer he has a genetic defect affecting which structures inside his cells?
What will be an ideal response?
The genetic defect prevents proper function of microtubules. Consequently, the flagella on the sperm could not move, and the cilia on the cells of the lung could not beat.
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How do cells become differentiated?
a) Different genes are expressed so that different proteins are produced. b) Paternal effect genes begin the process of differentiation by providing positional information. c) They differentiate through the process of mitosis. d) Some cells contain maternal chromosomes and some contain paternal chromosomes. e) The DNA in each cell changes so that the appropriate proteins are produced.
The signal from the environment that triggers a stereotyped behavior is a
A. reinforcing stimulus. B. key stimulus (sign stimulus). C. releasing mechanism. D. fixed action pattern. E. conditioned reflex.
Which external factors influence a cell to divide?
What will be an ideal response?
Nephrotic syndrome is characterized by
a. large amounts of protein. d. large amounts of urea. b. inability to thermoregulate. e. increased urine production. c. inability to urinate.