Which one of the following hormone pairs is antagonistic, in that they have opposing effects?

A) estrogen, progesterone
B) epinephrine, norepinephrine
C) glucagon, insulin
D) oxytocin, prolactin
E) thyroxine (T4 ) and triiodothyronine (T3 )


C

Biology & Microbiology

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Instinctive behaviors are distinguished from learned behaviors because instinctive behaviors are ____

while learned behaviors are ____.

a. genetically programmed responses; dependent upon experience b. dependent upon experience; genetically programmed responses c. acquired from observation; acquired from practice d. incomplete the first few times they are displayed; apparently a product of reason e. taught by parents; acquired from trial and error

Biology & Microbiology

Phosphorus is typically in short supply in aquatic and terrestrial ecosystems

Indicate whether the statement is true or false

Biology & Microbiology

One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered? 

A. paracrine B. autocrine C. endocrine D. direct contact E. synaptic

Biology & Microbiology

A ________ is a hollow tubelike structure that surrounds a chain of cells.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology