CH 10 Test Review
1. A larger cell is less efficientin moving nutrients and waste materialsacross the cell membrane.
2. The process by which a celldivides into two new daughter cells is called
Cell division
3. The production of genetically identicaloffspring from a single parent is known as asexual reproduction.
4. Offspring produced by sexual reproductioninherit some of their genetic information from each parent.
5. Genetic information is bundled into packages ofDNA known as chromosomes.
6. The chromosomes ineukaryotic cells form a close association with histones, a type of protein.This complex of chromosome and protein is referred to as chromatin.
7. During the cell cycle, a cell grows, prepares for division, and divides to form two daughter cells.
Interphase is divided into threeparts:
8. G1 phase,
9. S phase, and
10. G2 phase.
11. Cells do most of their growing during the G1 phase.
12. During theS phase, new DNA is synthesized whenthe chromosomes are replicated.
13. During theG2 phase, many of the organelles and molecules required for cell division are produced.
14. The M phase of the cell cycle, which followsinterphase, produces two daughter cells.
Biologists divide the events of mitosis into four phases:
15. prophase,
16. metaphase,
17. anaphase, and
18. telophase.
19. During prophase, the genetic material inside the nucleuscondenses and the duplicated chromosomes become visible. Outsidethe nucleus, a spindle starts to form.
20. The duplicated strands of the DNA molecule can be seen to be attached along their length at an area called the centromere.
21. Each DNA strand in the duplicated chromosome is referred to as achromatid.
22. Spindle fibers extend from a region called the centrosome, where tiny paired structures called centrioles are located.
23. During metaphase, the centromeres of the duplicatedchromosomes line up across the center of the cell. Spindle fibersconnect the centromere of each chromosome to the two poles ofthe spindle.
24. Duringanaphase, the chromosomes separate and move along spindle fibers to opposite ends of the cell.
25. During telophase, the chromosomes,which were distinct and condensed, begin to spreadout into a tangle of chromatin.
26. Cytokinesiscompletes the process of cell division—it splits one cell intotwo.
27. The process of cytokinesis is(the same/different) in animal and plant cells.
28. When injected into a non-dividing cell, this protein causes a mitotic spindle to form. This protein is calledcyclin
29. Growth factorsstimulate the growthand division of cells.
30. Apoptosisis a process of programmed cell death.
31. Cancer isa disorder in whichbody cells lose the ability to control growth.
32. Cancer cells forma mass of cells called a tumor.
33. Living things pass through a developmental stage called an embryo,from which the adult organism is gradually produced.
34.The process by which cells become specializedis known as differentiation.
35. A cell is totipotent if it isliterally able to do everything, to develop into any type of cell in thebody (including the cells that make up the extra-embryonic membranesand placenta).
36. After about four days of development, a human embryo forms into a blastocyst, a hollow ball of cells with acluster of cells inside known as the inner cell mass.
37. Cells that are pluripotentcan developinto most, but not all, of the body’s cell types.
38. The unspecialized cells from which differentiated cells develop are known as stem cells.
39. Because of their more limited potential, adult stem cells are referred to as multipotent,meaning that they can develop into many types of differentiated cells.
40. Stem cells offer the potential benefit of using undifferentiated cells to repair or replacebadlydamaged cells and tissues.