How many structural genes are under the control of the trp operon promoter?
A) 1
B) 2
C) 3
D) 4
E) 5
E
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The steady state so vital to life is possible because
A) the cell cannot convert energy from one form to another. B) all cells are autotrophic. C) the cell continually takes up energy from the environment. D) all reactions are at equilibrium. E) all reactions are exothermic.
Cholera is a bacterial disease, in which fatal dehydration can occur due to loss of water into the intestines. Cystic fibrosis is a human genetic disease characterized by excess mucus buildup on the linings of the lungs, making breathing difficult. Cholera acts on intestine cells to force water transport out of the cells and the body. Cystic fibrosis has an abnormal CFTR transport protein that limits water transport out of the cells and the body. How does the bacteria that causes cholera, Vibrio cholera, trigger potentially life-threatening diarrhea?
A. Cholera toxin stimulates CFTR, leading to decreased transport of water into the intestines. B. Cholera toxin causes a DNA genetic mutation that modifies the function of CFTR proteins. C. Cholera toxin inhibits CFTR, leading to decreased transport of water into the intestines. D. Cholera toxin inhibits CFTR, leading to increased transport of water into the intestines. E. Cholera toxin stimulates CFTR, leading to increased transport of water into the intestines.
Of the codons AAU, AUG, UAA, and UAU, which is considered a nonsense codon? What does this mean?
What will be an ideal response?
Select all of the following that are true about cephalopods.
A. They are very intelligent and are capable of learning by observation. B. They have a closed circulatory system C. They lack a shell. D. They are exclusively herbivorous. E. They may be very large and can weigh over 1000 pounds.