Methylene blue can be used to stain DNA because it
A) forms ionic bonds with DNA.
B) changes the pH and therefore the structure of DNA.
C) covalently bonds with DNA.
D) makes DNA electron dense.
E) is an effective fixing agent for nucleic acids.
A
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Recall that photosynthetic rates remain relatively constant in regions near the equator. Imagine that tropical environments persisted throughout Earth's northern and southern hemispheres (i.e., Earth's entire climate mirrored that near the equator)
If Keeling had collected his atmospheric CO2 data on such an Earth, what would you expect the Keeling Curve to look like? A. a straight line sloping upward (atmospheric CO2 levels do not seasonally oscillate, but have increased over time) B. a straight line sloping downward (atmospheric CO2 levels do not seasonally oscillate, but have decreased over time) C. a sinusoidal curve sloping upward (atmospheric CO2 levels fluctuate seasonally, but increase over time) D. a sinusoidal curve sloping downward (atmospheric CO2 levels fluctuate seasonally, but have decreased over time) E. a straight line without a slope (atmospheric CO2 levels have remained constant over time)
A flower forms from
a. an ovary tissue that migrates from the root. b. stem cells that form tumor like growths. c. impregnated pollen grains. d. a modified branch called a receptacle. e. bark tissue.
H. floresiensis fossils found on the Indonesian island of Flores have been dubbed “hobbits” by the media because of
what feature? a. They had small brains. b. They had large feet c. They were only 1 m tall. d. They had stone fireplaces. e. They were found to have lived in trees.
The presence of the pathogen in the blood called (bacteremia/parasitemia/viremia) is a defining feature of African sleeping sickness
What will be an ideal response?