Intermediate filaments
A) were first discovered in muscle cells.
B) are grouped into five classes based on the cell types in which they are found.
C) have molecular masses averaging 500 kDa.
D) are smooth and sticky.
E) assemble from nonfibrous filaments.
A) were first discovered in muscle cells.
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Which of these are produced directly by meiosis in pine?
(a) sperm cells. (b) pollen grains. (c) microspores. (d) microspore mother cells.
Which polymer serves as the information storage (genetic material) molecule for cells?
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are required to support other cells growing on top of the tissue. D. Epithelial tissues are programmed to stop dividing after only a few cell cycles. E. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur.
Your throat is dry, and you want the last cough drop in the box to last a long time in your mouth. What should you do?
A) Break the cough drop into little pieces and put them all in your mouth. Since each little piece must be dissolved separately, the drop will last longer. B) Keep the cough drop whole. This maintains the largest surface-to-volume ratio and slows the dissolution of the cough drop. C) Break the cough drop into little pieces and put them all in your mouth. This decreases the surface-to-volume ratio and slows the dissolution of the cough drop. D) It doesn't matter if the cough drop is in one piece or many pieces; the total amount of cough drop is all that matters.