Jib225W3 PART 2

Which of the following choices is not a basic feature of cellular communication? 

• The signal must be produced

• The signal can be produced only by a eukaryote

• The signal must be transported to a target cell

• The target cell must respond to the signal

When indirect signaling is used, the target cell responds to the signal when that chemical 

• binds to an enzyme

• binds to a receptor

• binds to a gene

• binds to the nuclear membrane

A chemical is termed a neurohormone when it is 

• released by neurons and endocrine glands

• released by an endocrine gland, but binds to receptors on a neuron

• released by a neuron, but travels in the blood like a hormone

The vertebrate hormones involved in water and electrolyte balance in the body are called 

• glucocorticoids

• ecdysteroids

• mineralocorticoids

Antagonists are compounds that bind to a receptor, but do not activate it

• TRUE

• FALSE

The response of a cell to a particular chemical messenger is determined by the ligand-binding domain

• TRUE

• FALSE

Enzymes that remove phosphates from other proteins are called kinases

• TRUE

• FALSE

In the nervous system, chemical messages cross a synapse, short distance between the signal and target cells

• TRUE

• FALSE

The term protein is used for chains more than fifty amino acids long, while the term peptide is reserved for shorter chains

• FALSE

• TRUE

In a __________ feedback loop, both the endocrine and nervous systems can be involved

• second order

  third order 

   

• second order 

• first order 

• first order

   second order