Plants are photosynthetic autotrophs. What does this mean?
A. The make their own food from organic materials.
B. They require pre-formed organic compounds.
C. They use light energy to drive the synthesis of organic molecules.
D. They are considered to be the consumers of the biosphere.
C. They use light energy to drive the synthesis of organic molecules.
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Which of the following statements about catabolic reactions is FALSE?
A. They recycle organic building blocks. B. They produce energy like ATP. C. They produce energy in the form of energy intermediates like NADH. D. They occur through the oxidation of substrates. E. They usually require an input of energy.
DNA associates very tightly with nucleosomes because
A. DNA can form covalent bonds with histone proteins. B. negative charges on DNA are attracted to positive charges of the histone proteins. C. the histone tails wrap tightly around the DNA double helix. D. the amino acids of histone proteins are largely acidic, while DNA molecules are basic. E. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
At which regulation level is DNA uncoiled and loosened from nucleosomes in eukaryotic organisms?
a. At the translational level b. At the epigenetic level c. At the transcriptional level d. At the post-transcriptional level
Why does a rattlesnake open its mouth before it even strikes?
What will be an ideal response?