What feature of the double-stranded DNA helix suggested to Watson and Crick a mechanism by which DNA could be replicated?
What will be an ideal response?
The complementary base pairing of the DNA helix suggested that each strand could act as a template for the synthesis of its complementary strand.
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What is a necessary component of a powerful immune system?
A. immunological tolerance B. strict temperature homeostasis C. thousands of different Ig genes D. a large thymus gland
The figure included shows the body temperature of lizards versus air temperature in two different habitats—open and shaded forest. Which one of the following conclusions is best supported by these data.
A. Lizards are more active in open habitats.
B. Lizards sunbathe more in open habitats.
C. Lizards in shaded forest habitats eat more to maintain their temperature.
D. The body temperature of lizards is more constant in open than in shaded forest habitats.
E. The negative effect of air temperature on body temperature is less in shaded forest habitats because the temperature varies less there.
Which of the following molecules can be used as a substrate for cellular respiration?
a. glucose only b. glucose and lipids only c. glucose and proteins only d. glucose, lipids and proteins only e. glucose, lipids, proteins and fatty acids
A low intracellular concentration of fixed nitrogen (and high level of ?-ketoglutarate) in Anabaena activates the NtcA global regulator, which ultimately controls the activity of ________ and ________
a. nitrogen fixation / heterocyst formation b. photosynthesis / endospore formation c. nitrogen fixation / endospore formation d. photosynthesis / heterocyst formation