Describe the DNA base sequence arrangement at the end of the Tetrahymena chromosome and the resolution of DNA replication at the end of a linear DNA strand
What will be an ideal response?
Telomeres terminate in a 5'-TTGGGG-3' sequence, and telomerase is capable of adding repeats to the ends, thus allowing the completion of replication without leaving a gap and shortening the chromosome following each replication.
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If researchers never evaluated the amount of 14C in the atmosphere, they could still use 13C levels to demonstrate causation between human activities and increased atmospheric CO2
A. true B. false
Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?
A. Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. B. Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. C. The diploid stage allows for genetic recombination. D. Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. E. Haploid cells cannot grow independently of diploid cells.
Which of the following is NOT involved in the lightdependent
reactions? a. ATP b. thylakoids c. chlorophyll d. stroma e. water
Which of the following is an example of vehicle transmission?
A. kissing B. having intercourse C. sharing a glass D. drinking contaminated water E. being bitten by a mosquito