What are polyribosomes and why are they important?
What will be an ideal response?
Polyribosomes are clusters of ribosomes held together on an mRNA molecule. This allows for multiple proteins to be synthesized from a single mRNA before it is degraded. This is particularly important in bacteria since they don't protect their mRNA.
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Diffusion is best defined as:
A. the random motion of individual molecules with net movement from areas of higher concentration to areas of lower concentration. B. the random motion of individual molecules with net movement from areas of lower concentration to areas of higher concentration. C. the highly ordered movement of large groups of molecules from areas of higher concentration to areas of lower concentration. D. the highly ordered movement of large groups of molecules from areas of lower concentration to areas of higher concentration. E. the transition from individual molecules moving in a random manner to groups of molecules moving in a highly ordered manner.
The process by which organisms maintain a stable internal environment in the face of a fluctuating external environment is called
A. metabolism. B. cellular respiration. C. growth and development. D. homeostasis. E. functional proteomics and genomics.
After the stage IV of the demographic transition, birth rates
A. are lower than death rates. B. equal 2 ? death rates. C. are higher than death rates. D. equal death rates. E. None of these choices are correct.
There is an antibiotic called streptomycin that doctors prescribe for infection. The antibiotic combines with the bacteria's ribosomes causing them to lose their function. Consequently the cell dies and so the person gets better! In other words, the antibiotic destroys bacteria by
a. stopping photosynthesis b. preventing them from packaging materials c. stopping the production of ATP energy d. not allowing them to produce proteins.