Abnormal chromosomes are frequently found in malignant tumors. Errors such as translocations may place a gene in close proximity to different control regions. Which of the following might then occur to make the cancer worse?
A) an increase in nondisjunction
B) expression of inappropriate gene products
C) a decrease in mitotic frequency
D) failure of the cancer cells to multiply
B
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Keratins are considered to be obligate heterodimers in that the dimers forming their filaments must contain one __________ and one __________ subunit?
Fill in the blank(s) with the appropriate word(s).
The largest number of food servings in your daily diet should be from
(a) meats and beans. (b) dairy products. (c) vegetables and fruits. (d) grains.
Which of the following is a common way in which both phosphorus and sulfur are deposited on land?
a. rock weathering b. condensation c. sublimation d. photosynthesis
Which statement correctly characterizes bound ribosomes?
a) The most common location for bound ribosomes is the cytoplasmic surface of the plasma membrane. b) Bound ribosomes generally synthesize membrane proteins and secretory proteins. c) Bound ribosomes are enclosed in their own membrane. d) Bound and free ribosomes are structurally different. e) All of the above.