Mitochondrial DNA can be used to trace ancestry and population history
A. true
B. false
A
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The number of linkage groups in an organism with sex chromosomes equals:
A. 1n B. 2n +1 C. 1n + 1 D. 2n + 2
The photosynthetic membranes of the green sulfur bacteria are called ________.
A. chlorocytes B. chloroplasts C. chlorophylls D. chlorosomes
The image shown above is an example of a(n) ____
a. random coil b. leucine zipper c. ? sheet d. ? helix e. ? polysaccharide
Which statement best explains contact inhibition?
a. Contact between neighbouring cells triggers reactions that lead to inhibition of mitosis. b. As cell number increases, the level of waste products increases, consequently slowing metabolism and leading to mitosis. c. As cell number increases, the protein kinases they produce compete with neighbouring cells, thus inhibiting mitosis. d. As neighbouring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur.