During meiosis in an organism where 2n = 8, how many chromatids will be present in a cell at the
beginning of meiosis II?
A. 2
B. 4
C. 6
D. 8
E. 12
D
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Changes in sediment distribution can be attributed to all except:
a. currents. b. burrowing animals. c. feeding activity of predators. d. temperature - salinity shifts.
Fred Griffith's experiment, in which he used two strains of Streptococcus pneumoniae, demonstrated that _____
a. pathogenic bacteria function differently in mice than in other organisms b. harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor c. pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains d. dead cells lose their genetic information e. DNA is a protein rich in nitrogen and phosphorus
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?
a. 23 or 46, depending on the portion of prophase examined b. 46 or 92, depending on the portion of prophase examined c. 23 d. 92 e. 46
Which of the following is NOT one of the 5 general steps of biotechnology?
Amplify a small amount of DNA Chop up DNA from a donor species Identify colonies that have received DNA containing the gene of interest Grow separate colonies containing different inserted pieces of donor DNA Insert different DNA segments into human cells to be grown and studied