Changes to an organism's DNA can cause unexpected traits to be expressed in its offspring. DNA in an individual's gametes will most likely be altered before being passed to offspring if exposed to
A. x-rays
B. loud sounds
C. magnetic fields
D. extreme temperatures
Answer: A. x-rays
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Which site on the ribosome is never occupied by a tRNA linked to a nascent polypeptide chain?
A. the A site B. the P site C. the E site
Whether the external temperature is hot or cold, birds maintain an internal body temperature of approximately 40?C. This is an example of.
A. metabolism. B. cellular respiration. C. growth and development. D. homeostasis. E. proteomics.
The frustule of diatoms is made of:
a. cellulose. b. calcium carbonate. c. silica. d. protein. e. starch.
Which of the following enables corals to grow in shallow waters?
a. mutualistic relationships with protists b. nutritionally rich water and silt c. high levels of ocean acidity d. calcium-rich plankton