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Which of these is responsible for initiating a signal-transduction pathway? (Activity 21C) 
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| A |
| B |
| C |
| D |
| E |
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What role does a transcription factor play in a signal-transduction pathway? (Activity 21C)
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| By binding to a plasma membrane receptor it initiates a cascade. |
| It relays a signal from the cytoplasm to the plasma membrane. |
| It activates relay proteins. |
| By binding to DNA it triggers the transcription of a specific gene. |
| It is a plasma membrane protein that binds signal molecules. |
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Click
on the diagram to start the video. Which of these, when activated by a signal-transduction
pathway, moved from the cytoplasm to the nucleus of a cell? (Activity 21C)
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| relay protein |
| DNA |
| plasma membrane receptor protein |
| signal molecule |
| transcription factor |
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Which of these is a membrane receptor? (Activity 21C) 
|
| A |
| B |
| C |
| D |
| E |
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A signal transduction pathway is initiated when a _____ binds to a receptor. (Activity 21C)
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| G protein |
| tyrosine kinase |
| calmodulin |
| signal molecule |
| cyclic AMP |
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A high concentration of bicoid protein at the opposite ends of a developing Drosophila embryo would result in the development of a _____. (Activity 21D)
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| two-headed fly |
| fly with a head growing out of its abdomen |
| fly with two abdomens |
| hermaphrodite |
| fly with legs growing out of its head |
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The bicoid gene product is directly responsible for _____ in a developing Drosophila embryo. (Activity 21D)
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| the establishment of the right-left axis |
| vulval development |
| flower development |
| the establishment of the anterior-posterior axis |
| apoptosis |
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The region of a Drosophila embryo with the highest concentration of bicoid protein will develop into the _____. (Activity 21D)
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| head |
| ovaries |
| vulva |
| homeobox |
| abdomen |
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What triggers the translation of bicoid mRNA? (Activity 21D)
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| formation of the right-left axis of the developing embryo |
| fertilization of the egg |
| apoptosis |
| capacitation of sperm |
| formation of the anterior-posterior axis of the developing embryo |
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The bicoid gene is a type of _____ gene. (Activity 21D)
|
| segmentation |
| pair-rule |
| segment-polarity |
| egg-polarity |
| gap |
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The region of a Drosophila embryo with a low concentration of bicoid protein will develop into the _____. (Activity 21D)
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| abdomen |
| male flowers |
| thorax |
| head |
| female flowers |
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How does bicoid protein get into a fertilized egg? (Activity 21D)
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| exocytosis |
| phagocytosis |
| diffusion |
| pinocytosis |
| receptor-mediated endocytosis |
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Bicoid mRNA is translated in _____. (Activity 21D)
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| Sertoli cells |
| the fertilized egg |
| sperm cells |
| chimera cells |
| nurse cells |
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Which of these regions is most likely to develop into the Drosophilia's head? (Activity 21D) 
|
| A |
| B |
| C |
| D |
| E |
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The bicoid gene is transcribed by _____. (Activity 21D)
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| a sperm cell |
| the zygote |
| the acrosome |
| nurse cells |
| embryonic cells |
