The organ that is responsible for secreting cocoons in the oligochaetes is known as the 

A. nephridia.
B. setae.
C. radula.
D. clitellum.
E. lophophore.


D. clitellum.

Biology & Microbiology

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The transgenic mouse models for amyotrophic lateral sclerosis (ALS) and Huntington disease show symptoms similar to those seen in humans affected by these conditions

a. True b. False Indicate whether the statement is true or false

Biology & Microbiology

The study of the body structures of the ostrich, emu and rhea shown here is an example of ____

a. morphological divergence b. comparative morphology c. anatomical convergence d. biogeography e. radiometric dating

Biology & Microbiology

The DNA-binding proteins of almost all regulatory proteins use one of a small set of shapes that enable them to fit into the DNA major groove. These shapes are called

A. DNA prints. B. structural motifs. C. fingerprints. D. repressors. E. transcriptional domains.

Biology & Microbiology

The genome of influenza virus is

A. multiple pieces of linear dsDNA. B. a single circular ssRNA. C. a single linear dsRNA. D. a single circular ssDNA. E. multiple pieces of linear ssRNA.

Biology & Microbiology