Briefly describe the basic process of DNA replication
What will be an ideal response?
DNA helicase unwinds the double helix of the parental DNA molecule. Then DNA polymerase pairs free nucleotides to be complementary to the parental DNA strand. The new nucleotides are then joined together to form two new strands of DNA paired with each of the original parental strands.
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Watson and Crick developed a model of DNA in which the two strands twist into the shape of a ________________.
A. circle B. helix C. double helix D. double pleated sheet
Supercoiling of double-stranded DNA is called its ______________ structure
A. primary B. secondary C. tertiary D. quaternary E. duplex
What sequence of events leads to the perception of a visual scene?
I. In response to light, retinal dissociates from rod and cone photopigments, hyperpolarizing the photoreceptor cells and leading to activation of bipolar neurons. II. Action potentials are propagated through ganglion cells, whose axons project to the occipital lobe of the brain. III. In response to light, rod and cone photoreceptors depolarize, causing increased release of neurotransmitter and activation of bipolar neurons. A. I then III B. III then II C. III then I then II D. I then II then III E. I then II
All cells possess a _____________
a. cell wall b. nucleus c. plasma membrane d. nucleolus