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WorksheetsCellular Communication
Total questions: 20
Worksheet time: 20mins
To respond to a signal, a cell must have a(n) ______________ molecule that can detect the signal.
paracrine
receptor
autocrine
responder
For a G protein to play its part in moving events forward in a signal pathway,
GDP must be released, and a GTP must occupy the nucleotide-binding site.
GTP must be released, and a GDP must occupy the nucleotide-binding site.
cGMP must occupy the otherwise empty nucleotide-binding site.
it must be linked to a specific intracellular receptor.
Signal transduction pathways benefit cells for all of the following reasons EXCEPT -
they help cells respond to signal molecules that are too large or too polar to cross the plasma membrane
they enable different cells to respond appropriately to the same signal
they help cells use up phosphate generated by ATP break-down
they can amplify a signal
Signals that travel to distant cells through the circulatory system are known as
paracrine signals
parasitic signals
autocrine signals
hormones
Which of the following provides the best evidence that cell signaling pathways evolved early in the history of life?
They are seen in "primitive" cells such as yeast.
Yeast cells signal each other for mating.
Signal transduction molecules found in distantly related organisms are similar.
Signals can be sent long distances by cells.
Which statement about HIV and AIDS is true?
Opportunistic infections as a result of HIV infection are the usual cause of AIDS deaths.
HIV causes death directly
AIDS typically arises from HIV infection after a dormancy period of one month.
The HIV viral load rises steadily from the initial infection.
Which pair incorrectly matches a pituitary hormone with its target organ?
Oxytocin - mammary glands
Antidiuretic hormone - kidney
Follicle stimulating hormone - ovary
Luteinizing hormone - liver
Newborn kittens can often be observed bumping their heads against their mother's belly before they begin nursing. The behavior likely stimulates the release of ______________ in the mother.
oxytocin
prolactin
parathyroid hormone
ADH
B cells mature in
the thymus
lymph nodes
bone marrow
the spleen
If you were vaccinated against measles as a child, you still have immunity to the disease decades later because
plasma cells secrete cytokines.
effector T cells secrete antibodies.
memory B cells can persist in the body for several decades.
cytotoxic T cells can live for several decades.
The cell labeled A is a ____________________ cell involved in a(n) ________________________ immune response.
mast; innate
B lymphocyte; humoral
T lymphocyte; cellular
T-helper; adaptive
Antibodies are made by
T cells
B cells
Macrophages
Basophils
The nervous and endocrine systems
have opposing functions
serve only to control each other's processes
work together and can affect each other
both produce chemicals that have very long-range effects
White blood cells can defend the body against invaders through
phagocytosis
pinocytosis
active transport
exocytosis
Which type of molecule is most likely responsible for fever during inflammation?
Histamines
Complement proteins
Cytokines
Lysozymes
In autoimmune diseases such as rheumatoid arthritis, damage to tissue occurs when the immune system fails to
induce the production of IgE by mast cells
distinguish self tissues from pathogens
induce the production of lysozyme
induce platelet aggregation
Which statement about the endocrine system is FALSE?
Target cells have the appropriate receptors for binding a particular hormone.
Some endocrine cells exist as scattered single cells within a tissue.
Hormones travel in the blood to target cells
Endocrine glands have ducts that lead to the outside of the body.
Which response would likely NOT be observed in a person injected with epinephrine?
Increased response of heart muscles
Activation of G proteins
Faster heart rate
Sudden feeling of fatigue.
Which statement about natural killer cells is false?
They are a class of lymphocytes.
They are phagocytic.
They can distinguish between normal cells and cells that have been infected by viruses.
They can induce lyses of targeted cells.
Which statement is false?
Protein kinase receptors are a type of cytoplasmic receptor.
Cells are bombarded with numerous signals, but they respond to only a few.
Receptor proteins are very specific.
A cell's receptors determine whether or not the cell will respond to a signal.
