Biology 09 Cell Communication MCQ


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This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Unit 2. The Cell

Chapter 09: Cell Communication MCQ Multiple Choices Questions Quiz Test Bank

9.1 Signaling Molecules and Cellular Receptors

9.2 Propagation of the Signal

9.3 Response to the Signal

9.4 Signaling in Single-Celled Organisms

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Biology 09 Cell Communication MCQ
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Sample Questions from the Biology 09 Cell Communication MCQ Quiz

Question: What property enables the residues of the amino acids serine, threonine, and tyrosine to be phosphorylated?


They are polar.

They are non-polar.

They contain a hydroxyl group.

They occur more frequently in the amino acid sequence of signaling proteins.

Question: What is the effect of an inhibitor binding an enzyme?


The enzyme is degraded.

The enzyme is activated.

The enzyme is inactivated.

The complex is transported out of the cell.

Question: Apoptosis can occur in a cell when the cell is ________________.



no longer needed

infected by a virus

all of the above

Question: Which type of molecule acts as a signaling molecule in yeasts?




mating factor

second messenger

Question: What property prevents the ligands of cellsurface receptors from entering the cell?


The molecules bind to the extracellular domain.

The molecules are hydrophilic and cannot penetrate the hydrophobic interior of the plasma membrane.

The molecules are attached to transport proteins that deliver them through the bloodstream to target cells.

The ligands are able to penetrate the membrane and directly influence gene expression upon receptor binding.

Question: What is the function of a phosphatase?


A phosphatase removes phosphorylated amino acids from proteins.

A phosphatase removes the phosphate group from phosphorylated amino acid residues in a protein.

A phosphatase phosphorylates serine, threonine, and tyrosine residues.

A phosphatase degrades second messengers in the cell.

Question: Endocrine signals are transmitted more slowly than paracrine signals because ___________.


the ligands are transported through the bloodstream and travel greater distances

the target and signaling cells are close together

the ligands are degraded rapidly

the ligands don't bind to carrier proteins during transport

Question: Why are ion channels necessary to transport ions into or out of a cell?


Ions are too large to diffuse through the membrane.

Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane.

Ions do not need ion channels to move through the membrane.

Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.

Question: The secretion of hormones by the pituitary gland is an example of _______________.


autocrine signaling

paracrine signaling

endocrine signaling

direct signaling across gap junctions

Question: How does NF-κB induce gene expression?


A small, hydrophobic ligand binds to NF-κB, activating it.

Phosphorylation of the inhibitor Iκ-B dissociates the complex between it and NF-κB, and allows NF-κB to enter the nucleus and stimulate transcription.

NF-κB is phosphorylated and is then free to enter the nucleus and bind DNA.

NF-κB is a kinase that phosphorylates a transcription factor that binds DNA and promotes protein production.

Question: Where do DAG and IP3 originate?


They are formed by phosphorylation of cAMP.

They are ligands expressed by signaling cells.

They are hormones that diffuse through the plasma membrane to stimulate protein production.

They are the cleavage products of the inositol phospholipid, PIP2.

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