Which of these is a component of ribosomes?
A. DNA
B. rRNA
C. tRNA
D. ribosome
B. rRNA
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Gamma radiation
A. is used to sterilize some food products. B. is a type of nonionizing radiation. C. has a longer wavelength than UV radiation. D. has poor penetrating power.
Compared to the sunflowers, birch trees are:
A. r-selected. B. K-selected. C. less competitive. D. All of the responses are correct. E. None of the responses is correct.
The ultimate fate of the energy used by organisms is ____
a. conversion into heat b. transmission onto offspring c. to be recycled repeatedly without loss d. to be recycled as metabolic energy e. move into the environment by conduction
Biological evolution is the process whereby
A. living cells arose from nonliving chemicals. B. prokaryotic cells became eukaryotic cells. C. humans descended from apes. D. only the strongest survive. E. species change through time.