Which of the following is likely required to initiate cell differentiation during development?
A. cell division
B. the presence of certain mRNAs needed for expression of cell-specific proteins
C. the buildup of cell-to-cell adhesion molecules
D. the presence of carbohydrates
E. hydration of the egg during fertilization
B. the presence of certain mRNAs needed for expression of cell-specific proteins
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Intermediate filaments:
A. have a diameter that is larger than a microfilament, but smaller than a microtubule. B. play an important role in maintaining cell shape. C. plan an important role in preventing skin from tearing by shear stress. D. undergo little change in length in comparison to microtubules and microfilaments. E. All of these choices are correct.
The complete replacement of one type of organ with another is called
a. homeotic gene replacement d. modularity b. evo-devo e. punctuated equilibrium c. homoeosis
Which of the following are jawless fishes?
A. lampreys B. sharks C. tuna D. salmon E. skates
Closely linked genes nearly always end up ____
a. crossing over b. assorting independently c. in the same gamete d. segregated during meiosis e. inverted