What is the configuration of the tRNAs and polypeptide on the ribosome just after peptide bond formation?
What will be an ideal response?
Ans: The polypeptide is transferred from the peptidyl-tRNA at the P site to the aminoacyl-tRNA at the A site and the tRNA at the P site is discharged (it no longer has a polypeptide attached, as the aminoacyl bond to the ribose is broken).
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Those dinoflagellates that live in an intimate association with corals are called
A. lichens. B. zooxanthellae. C. phytoplankton. D. parasites.
A typical primary response to an antigen peaks at about____
a. one-two days b. four-five days c. two weeks d. two months e. four months
The study of organisms requires the use of
a. only large general categories of organisms b. only small specific categories of organisms c. both large and small categories of organisms d. no categories of organisms
One hypothesis explaining animals' abilities to detect a magnetic field and use it to navigate is that sensory cells detect electrical fluctuations influenced by Earth's magnetic field. Which evidence, if it were true, would support this hypothesis?
A) Sensory cells of an organism known to use magnetic fields to navigate show an increase in action potential firing when in the presence of electrical fluctuations. B) Sensory cells of an organism known to use magnetic fields to navigate show a decrease in action potential firing when in the presence of electrical fluctuations. C) Sensory cells of an organism known to use magnetic fields to navigate show a greater density of negative ions on the outside of its plasma membrane. D) Sensory cells of an organism known to use magnetic fields to navigate produce greater amounts of enzymes sensitive to electrical fluctuations.