When introduced into mitotic cells, which of the following is expected to impair anaphase B but not anaphase A?
(a) an antibody against myosin
(b) ATP?S, a nonhydrolyzable ATP analog that binds to and inhibits ATPases
(c) an antibody against the motor proteins that move from the plus end of microtubules to the minus end
(d) an antibody against the motor proteins that move from the minus end of microtubules toward the plus end
(d) The motor proteins used in anaphase B to push the interpolar microtubules apart move toward the plus end of microtubules, whereas the motor proteins used in anaphase A move toward the minus end. Myosin [choice (a)] is not involved in either anaphase A or anaphase B. Motor proteins require ATP hydrolysis (they are ATPases) to function and are used in both anaphase A and anaphase B, so both types of anaphase will be affected by ATP?S [choice (b)]. The motor proteins used in anaphase A move toward the minus end of microtubules, as do the motor proteins used in anaphase B that are attached to the cell cortex [choice (c)].
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Match the organelle to its function.
A) turgor pressure B) ribosome production C) support and flexibility D) synthesis of complex polysaccharides E) photosynthesis F) synthesis of secretory proteins G) detoxification of hydrogen peroxide H) contains pigments in flowers I) storage of hydrolase J) boundary of the cell K) protein synthesis L) oxidation of sugars M) cell shape and movement of organelles N) information center O) steroid synthesis 1) nucleus 2) mitochondrion 3) chloroplast 4) nucleolus 5) rough endoplasmic reticulum 6) smooth endoplasmic reticulum 7) extracellular matrix 8) cytoskeleton 9) chromoplast 10) Golgi complex 11) lysosome 12) peroxisome 13) central vacuole 14) ribosome 15) plasma membrane
What term describes the process of an unfertilized egg developing into a normal offspring?
a. parthenogenesis b. sexual reproduction c. budding d. fragmentation
All of the following statements are true about mitosis except
A. spindle fibers are involved in the movement of chromosomes. B. the cells arising from the process all have half of the genetic material. C. the process of mitosis is followed by cytokinesis. D. both sexually and asexually reproducing organisms utilize the process of material
Which reproductive method would most likely lead to the greatest chance of success in sea stars?
A. sexual reproduction B. budding C. fragmentation D. None of these methods would be successful.