How long after initiation of a primary response do significant amounts of antibody appear in the blood?
A.
One day
B. 10-14 days
C. 4 weeks
D. 6 months
B
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Which characteristic enabled vertebrates to reproduce on land?
1.amniotic egg 2.dorsal nerve cord 3.endoskeleton 4.notochord
When comparing viruses and bacteria, which one of the following statements is CORRECT?
A) Viruses are larger than bacteria. B) Viruses are pathogens; bacteria are decomposers. C) Viruses have membrane-bound organelles; bacteria do not have membrane-bound organelles. D) Viruses and bacteria are both able to reproduce on their own. E) Viruses and bacteria both contain genetic material.
One of her colleagues suggested she try increased methylation of C nucleotides in the DNA of promoters of a mammalian system. Which of the following results would she most likely see?
A) decreased chromatin condensation B) activation of histone tails for enzymatic function C) higher levels of transcription of certain genes D) inactivation of the selected genes
A suspension of algae is illuminated and supplied with constant CO2. When the light is turned off, the concentration of compounds from the Calvin cycle changes. The concentration of compound A increases significantly. What is compound A?
What will be an ideal response?