In multicellular organisms, specialization in
structure and function of cells is caused by
a. inhibition of transcription.
b. methylation of nucleotides.
c. a differential expression of genes.
d. translation without transcription.
e. more than one of these.
C
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Energy is defined as
A. heat. B. the capacity to do work. C. change. D. movement.
What is the specific role of cyanobacteria (or green algae) in lichens?
A. to help attach the lichens to surfaces B. to synthesize defensive compounds C. to provide fungi with nutrients in usable forms D. to transport water throughout lichens E. Cyanobacteria and green algae play no role in lichens, as lichens consist of fungi.
The concept that a set of three nucleotides specifies a particular amino acid provides the basis for
A) the one-gene-one-enzyme hypothesis. B) the one-gene-one-polypeptide hypothesis. C) the genetic code. D) biochemical reactions among nucleic acids. E) All of these
The bacteriophages used in Alfred Hershey's and Martha Chase's experiments showed that:a
DNA was injected into bacteria. b. DNA and protein were injected into bacteria. c. DNA remained on the outer coat of bacteria. d. proteins were injected into bacteria. e. proteins were responsible for the production of new viruses within the bacteria.