The physical structure that is formed when two chromatids cross over is called a(n) _______

A. synaptonemal complex
B. bivalent
C. karyotype
D. chiasma


D

Biology & Microbiology

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Neuropeptide neurotransmitters ____

a. can act as direct neurotransmitters between neurons and muscle cells b. can act as postsynaptic membrane inhibitors c. directly open K+ channels to inhibit neurons d. can act as pain reducers and initiate euphoria e. directly inhibit euphoria

Biology & Microbiology

Applied researchers conduct their work to:

a. solve specific practical problems. b. solve any problem they face. c. answer all questions. d. advance our collective knowledge of living systems. e. prove hypotheses.

Biology & Microbiology

Which of the following is associated with echinoderms?

a. water vascular system b. open digestive system c. closed urinary system d. asexual reproductive system

Biology & Microbiology

Recessive traits are expressed only in the homozygous state. Indicate whether the statement is true or false

Biology & Microbiology