The subunits of a ribosome are referred to as being 40S. The "S" refers to ________.
Fill in the blank(s) with the appropriate word(s).
Svedberg units (S), a unit of sediment coefficient
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In mitosis,
a. the chromosome number is halved. b. the chromosome number is doubled. c. the chromosome number stays the same. d. the chromosome number may double or be halved depending on the species. e. gametes are formed in bacteria only
Which species of wheat is the first polyploid in the
sequence? a. A b. B c. C d. D e. E
Enkephalins and endorphins are
a. neuromodulators. b. stimulators of brain and nervous activity. c. inhibitors of pain perception. d. neuromodulators and stimulators of brain and nervous activity. e. neuromodulators and inhibitors of pain perception
Which of the following characteristics are expected in the first animals to have colonized land?
1. were probably herbivores (ate photosynthesizers) 2. had four appendages 3. had the ability to resist dehydration 4. had lobe-finned fishes as ancestors 5. were invertebrates A) 3 only B) 3 and 5 C) 1, 3, and 5 D) 1, 2, 3, and 4