Which of the following statements about isotopes in living systems is false?
a. Radiation can be used to create visual images
b. Living organisms can avoid taking up a radioactive isotope but still absorb the normal isotope of the same element.
c. Radioactive sugar is used to measure rates of cell activity.
d. Radioisotopes can be used as tracers to follow the movement of an element through a living system.
b
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Signal recognition particles (SRPs) are associated with the Sec translocation system.
Answer the following statement true (T) or false (F)
The intestinal parasite Ascaris lumbricoides currently infects more than one billion people. Which group is it in?
a. flatworms b. roundworms c. annelids d. cnidarians e. arthropods
How many ATP molecules (net yield) are
produced per molecule of glucose degraded during glycolysis? a. 1 b. 2 c. 4 d. 36 e. 38
Which type of RNA is found in eukaryotes and has an instrumental role in RNA processing?
A) rRNA B) tRNA C) snRNA D) mRNA E) All of these