Helicase ________.
A. supercoils DNA
B. unwinds RNA
C. winds RNA
D. unwinds DNA
Answer: D
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Mitochondria and hydrogenosomes are similar in that they both
A) are the site of energy production in eukaryotic cells. B) evolved via endosymbiosis of bacterial cells. C) are the site of aerobic respiration. D) evolved via endosymbiosis and are sites for aerobic respiration and energy production.
Why is it unlikely that DNA was NOT the first
self-replicating molecule of life?
a. nitrogen is essential for constructing DNA and there was no nitrogen on early Earth b. DNA is hyper-sensitive to oxygen and would have disassembled quickly in its presence c. DNA requires proteins like DNA polymerase for assembly so it doesn’t truly “self-replicate” d. it must have RNA to self-replicate and RNA evolved much later in life’s history e. more than one of these is correct
If pathogen A is more resistant to an erythromycin disc on a Kirby-Bauer plate compared to pathogen B, then pathogen A will have a/n ________ zone of inhibition compared to pathogen B.
A. smaller B. equal C. larger
The functional unit of the nervous system is the
A) cell body. B) neuron. C) axon. D) synapse.