The hypothesis that life evolved on another planet and was transported to Earth by meteorites cannot be disregarded
Why?
What will be an ideal response?
ANSWER: The hypothesis is not testable. Most scientists believe it is unlikely, but it cannot be ruled out by experimentation.
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A life cycle that regularly alternates between haploid and diploid stages is found in all of the following EXCEPT
A. dogs B. the bacterium E. coli C. alfalfa plants D. the mold N. crassa
Plasma membrane phospholipids are labeled with a fluorescent tag and then the phospholipids in one area are bleached with a laser beamto eliminate the fluorescent signal. What would one observe after the cell is incubated for a few minutes?
A. The bleached molecules would disappear into the cell. B. The bleached molecules would diffuse laterally through the membrane and intermix with unbleached molecules. C. The bleached molecules would remain in the spot where bleaching occurred. D. All the bleached molecules would flip-flop across the cell membrane. E. The bleached molecules would be released from the cell.
Suppose you have a way to measure the amount of DNA in one cell during the cell cycle. You first measure the amount at the G1 phase. At what points in the rest of the cycle will you see a change in the amount of DNA per cell?
What will be an ideal response?
What is the role of the Golgi apparatus in cellular function?
A) Protein packaging B) Replication of DNA C) Protecting the integrity of the cell's shape D) Filling the cell space with fluid E) mRNA synthesis