Most amino acids are specified by more than one codon. Indicate whether the statement is true or false
T
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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.
Which membrane proteins move specific substances across a membrane, typically by forming a channel?
a. transport b. receptor c. recognition d. adhesion e. enzymes
Researchers tend to name genes based on what
happens in their absence. The tinman gene in Drosophila results in flies a. without hearts. b. with nonjointed legs. c. with a thick exoskeleton. d. with rust colored eyes. e. without brains.
The zygote is converted into the morula in the ____
a. ovary b. uterus c. vagina d. oviduct e. cervix