Is the genetic code the same in all living organisms?
What will be an ideal response?
Ans: The genetic code is nearly the same for prokaryotes and the eukaryotic nuclear genes. The exception is the genetic code involving one of the stop codons for some unicellular eukaryotes and mitochondria. The universality of the code suggests that it was established very early in evolution.
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How did Davis demonstrate that bacterial cells must be in physical contact in order for genetic exchange to occur?
A. He mixed together two bacteria strains with different nutritional requirements, and then added them to agar plates that lacked their required nutrients. B. When two bacterial strains with different nutritional requirements were combined in a tube and allowed to grow for several hours, they acquired the ability to grow without the addition of biotin. C. When two bacterial strains with different nutritional requirements were separated from each other by a selective filter, they did not acquire the ability to grow on agar plates that lacked their required nutrients. D. Only when enough pressure was applied to force bacteria from one side of a selective filter to another did they acquire the ability to grow without their required nutrients. E. Nutritional deficient strains only acquired the ability to grow without their required nutrients when the pore size of a selective filter was increased to allow bacteria to pass from one side to the other.
The tree line in alpine areas is often determined by a combination of
A. wind and water. B. water and soil type. C. salts in the soil. D. low temperatures and high winds. E. high temperatures and high winds.
Which of the following is not true of the light-dependent reactions of photosynthesis?
A. They generate NADPH. B. They generate glucose from CO2 and H2O. C. ATP is generated by a chemiosmotic mechanism. D. The photons cause magnesium to release electrons. E. They occur in thylakoid membranes.
Law of Conservation of Matter
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