The genetic codes for STOP codons are
A) AUG, UGA and CAC
B) UAU, AAU and GAU
C) UAA, UAG and UGA
D) CAA, AGA and AAU
Answer: C) UAA, UAG and UGA
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In individuals with normal blood sugar levels, glucose is reabsorbed into the bloodstream in the kidney by members of the GLUT transporter family, which form an aqueous pore across the membrane through which glucose can move passively. As a result, no glucose is excreted in urine. However, in people with untreated diabetes mellitus, blood sugar levels are high and glucose is often present in the
urine. What can explain this occurrence? A. High blood glucose levels reverse the concentration gradient, allowing untransported glucose to be excreted in urine. B. High blood glucose levels interfere with the coupled transport of water and glucose, allowing untransported glucose to be excreted in urine. C. The GLUT transporters become saturated, allowing untransported glucose to be excreted in urine. D. The GLUT transporters cannot hydrolyze ATP quickly enough for ATP to transport the extra glucose, thereby allowing untransported glucose to be excreted in urine.
Which statement about mutations is not true? (Choose all that apply)
A. Mutations make evolution possible. B. Mutations result in genetic variation among individuals. C. Mutations accumulate in a genome over time. D. Mutations are usually caused by exposure to radiation. E. Mutations can be harmful, beneficial or neutral. F. Mutations occur as a direct response to an organism's attempt to change one of its traits.
Put the following steps of the HIV life cycle in order:1.Viral
RNAs and proteins assemble into new viral particles that bud from the cell. 2.DNA copy of the viral genome is integrated into the host genome. 3.Viral reverse transcriptase makes a DNA copy of the viral RNA genome. 4.Viral particle enters the cell. 5.The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.
a. 3,2,5,1,4 b. 2,3,4,5,1 c. 4,2,3,1,5 d. 2,4,3,5,1 e. 4,3,2,5,1
Which of the following is not true? a. Even if the total fertility rate drops to the replacement level, population will continue to increase for over 50 years
b. China has a wide-reaching family planning program. c. World population is expected to peak at 8.9 billion in 2050. d. The worldwide total fertility rate has been increasing steadily for 50 years.