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
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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
True-breeding individuals are produced by repeated backcrossing
Indicate whether the statement is true or false
The Greek root words for "branch" and "picture" form the biological term
A. binomial nomenclature. B. taxonomy. C. cladogram. D. systematics. E. phenogram.
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.