When cells begin to move in the embryo in relation to other cells, this is called
A. growth.
B. cleavage.
C. morphogenesis.
D. fertilization.
E. differentiation.
Answer: C
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A transcriptional regulator that decreases transcription of a gene from a vast distance is known as a(n
A) enhancer. B) upstream control element. C) regulator. D) nonsense mutation. E) silencer.
Which of the following is not a normal causative agent of acute diarrhea with vomiting (food poisoning)?
A. Clostridium perfringens B. Bacillus cereus C. Staphylococcus aureus D. Clostridium difficile
When the method is perfected, it will be possible to transfer "healthy" genes into cystic fibrosis patients via aerosol inhalants to "cure" this genetic disease. Is this type of gene transfer an actual cure or is it a treatment? In other words, could this person still pass along cystic fibrosis genes?
What will be an ideal response?
When a jogger starts to run, the rate at which his muscles produce CO2 rises sharply. The CO2 in his blood rises only slightly before he starts to breathe faster and his heart starts beating stronger. Soon his increased rate of CO2 production is balanced by an increased rate of CO2 removal. This would be an example of __________ feedback because the jogger's circulatory and respiratory systems are __________.
a. negative; restoring the CO2 concentration to a set point b. positive; improving the operating conditions in the jogger's body c. positive; decreasing the CO2 concentration d. positive; restoring the CO2 concentration to a set point e. negative; acting in opposition to one another