The loading of dissolved sugars into the sieve tube elements of phloem is:
a. passive transport.
b. active transport.
c. osmosis.
d. simple diffusion.
e. facilitated diffusion.
b
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In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. no errors will be made during transcription. C. the nucleosome will quickly form, which assists in mRNA formation. D. once that gene is transcribed, the mRNA is saved and used over and over again. E. once a gene is turned off, it will remain off.
Organisms that are used to decontaminate soils ____
a. cannot store pollutants in their tissues b. cannot release pollutants into the air c. do not degrade pollutants d. typically die from the pollutants e. release pollutants into the air and/or degrade the pollutants
The bicoid protein of a fruit fly is an example of _____
a. embryonic induction b. epigenetics c. differentiation d. a morphogen e. assimilation
Homo sapiens have existed on earth for 2% of the earth's history.
Answer the following statement true (T) or false (F)