The hypothesis that explains the origin of eukaryotic cells as the result of two or more simpler cells developing a relationship with one another is called:
A) symbiosis
B) evolution theory
C) endosymbiont theory
D) panspermia
Ans: C) endosymbiont theory
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Genetic exchange between 2 homologous chromosomes is called
A. synapsis. B. pleiotropy. C. crossing over. D. allelic exchange. E. independent assortment.
Which of the following is the most likely explanation for the band pattern seen in lane 6?
A. Protein D is a restriction enzyme and cut the DNA fragment into two DNA fragments. B. Protein D binding to the CRP-binding site is less tight compared to cAMP-CRP binding. C. Protein D has a smaller mass than the cAMP-CRP protein. D. Protein D removed radioactive label from the DNA fragment.
Phrases 60–69 refer to the eukaryotic cell cycle. Select the single
BEST choice for each phrase. a. G2 b. mitosis c. S d. G1 e. cytokinesis E 60. period when DNA is duplicated E 61. last part of interphase in the parent cell (i.e. when the cell is no longer in interphase) M 62. event that forms two daughter cytoplasmic masses D 63. period of cell growth before DNA duplication E 64. period after DNA is duplicated M 65. period of nuclear division E 66. period when interphase begins in a daughter cell M 67. period commonly followed by cytokinesis M 68. period in which metaphase occurs D 69. period prior to mitosis
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia)
Using radiometric dating, scientists can show that these people were alive as recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools?