Which of the following characteristics are unique to eukaryotes (i.e., do not occur in either archaea or bacteria)? (Select all correct choices.)

A. the presence of introns in most genes (non
-coding stretches of DNA)
B. the presence of exons in most genes
(coding stretches of DNA)
C. the presence of chlorophyll
D. the presence of nuclei


A,D

Biology & Microbiology

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Differentiation in complex multicellular organisms occurs when:

A. All of the answer options are correct. B. different combinations of genes are activated and repressed in different cells. C. cells in different environments are exposed to different types of signals. D. different combinations of proteins are expressed in different cells. E. cells acquire different fates.

Biology & Microbiology

Discuss the concept of inclusive fitness. What will be an ideal response?

Biology & Microbiology

Antibodies are nonspecific

Indicate whether the statement is true or false

Biology & Microbiology

Biochemical data suggest that eukaryotic cells are closer evolutionarily to the ______ than to the _____

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology