Maternal effect genes form gradients in the developing egg of chemicals called:a

maternal Hox proteins.
b. segmens.
c. differens.
d. morphogens.
e. maternal growth factors.


D

Biology & Microbiology

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The three major components of a cell are the nucleus, cytoplasm, and __________

a. plasma membrane b. phospholipids c. epithelium d. receptor proteins

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True-breeding individuals are produced by repeated backcrossing

Indicate whether the statement is true or false

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The Greek root words for "branch" and "picture" form the biological term

A. binomial nomenclature. B. taxonomy. C. cladogram. D. systematics. E. phenogram.

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Which statement regarding the brain is true?

A) Ventricles in the brain are filled with interstitial fluid. B) The blood-brain barrier helps to maintain a stable chemical environment for the brain. C) Layers of connective tissue, called epithelium, surround and protect the brain and spinal cord. D) White matter is composed of mainly dendrites.

Biology & Microbiology