__________, products of master genes, act as longrange

signals that diffuse out from a source and form
a concentration gradient. Fill in the blank(s) with the appropriate word(s).


Answer: Morphogens

Biology & Microbiology

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Non-inbred mice had a consistently lower survival than inbred mice

__________ Indicate whether the statement is true or false.

Biology & Microbiology

For your eye to focus on this sentence:a

the ciliary muscle would need to contract for the lens to get rounder. b. the ciliary muscle would need to contract for the lens to get flatter. c. the ciliary muscle would need to relax for the lens to get rounder. d. the ciliary muscle would need to relax for the lens to get flatter. e. the ciliary muscle is not connected to the lens and therefore, not involved in vision.

Biology & Microbiology

Neurons rely on glial cells for

a. protection. b. metabolic support. c. insulation. d. All of the above

Biology & Microbiology

How many sperm participate in the formation of fraternal twins?

A) two B) four C) one D) three

Biology & Microbiology