In the Meselson and Stahl (1958 ) experiment, bean plants (Vicia faba) were radioactively labeled so that autoradiographs could be made of chromosomes
Indicate whether the statement is true or false
FALSE
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Natural selection operates directly on
(a) the genotype. (b) individual alleles. (c) the phenotype. (d) color only.
How do eukaryotic cells maintain underwound DNA?
A. They have a topoisomerase that can introduce negative supercoils. B. They can introduce negative supercoils by wrapping the DNA around proteins. C. They only relax the positive supercoils that form during transcription and let the negative ones accumulate. D. All of these choices are correct. E. None of these choices is correct.
The effects of hyposecretion and hypersecretion of adrenal cortex hormones result in
A. exactly opposite symptoms: too much versus too little melanin, thin versus heavy, etc. B. various mild symptoms that are not life threatening. C. exactly the same symptoms due to failure to have correct hormone levels. D. masculinization of women and feminization of men. E. opposite effects on kidney functions and therefore blood pressure, but varying effects on other target tissues.
What is a benefit of multicellularity for slime mold amoebas?
a. self-sacrifice for other amoebas c. sexual reproduction b. ability to move quickly to nutrients d. ability to feed on bacteria