Which one of the following statements about the incorporation of selenocysteine into proteins is true?
A. Selenocysteine is an example of a posttranslational modification.
B. The tRNA used to translate selenocysteine at a stop codon is first charged with serine.
C. The tRNA used to translate selenocysteine at a stop codon has an anticodon sequence of UGA.
D. The serine bound to the tRNA used to translate selenocysteine at a stop codon is converted to selenocysteine by the enzyme SelB.
B
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Some human infants, especially those born prematurely, suffer serious respiratory failure because of _____
A) the sudden change from the uterine environment to the air B) the overproduction of surfactants C) the incomplete development of the lung surface D) lung collapse due to inadequate production of surfactant E) mutations in the genes involved in lung formation
The relationship between the clownfish and the sea anemone it is associated with is an example of mutualism
Indicate whether the statement is true or false
Which of the following statements is false?
a. The gametophytes of the ferns are free-living. b. The ferns are the largest and most diverse group of seedless, vascular plants. c. All the ferns and related primitive vascular plants have haploid sporophytes. d. Most ferns are tropical. e. Many of the ferns and their relatives have underground stems called rhizomes.
What is the current world's population?
A. over 10 billion B. over 7 billion people C. almost 3 billion people D. almost 5 billion people E. almost 1 billion people