During translation, the nucleotides that make up the mRNA are read in groups of three. These groups are called
A. introns.
B. codons.
C. anticodons.
D. templates.
E. exons.
Answer: B
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Which of the following types of cloning vector can carry the largest amount of foreign DNA?
A. plasmid B. bacterial artificial chromosome C. cosmid D. bacteriophage
Inactive Ras is bound to receptor tyrosine kinases by ____
a. G proteins b. adapter proteins c. phosphate bonds d. peptide tethers e. GDP
The evolution of organisms in the three domains and four kingdoms is most accurately described by which sequence?
A. Protists to Prokaryotes to Fungi, from Fungi separately to Plants and Animals B. Prokaryotes to Protists to Plants, from Plants separately to both Animals and Fungi C. Prokaryotes to Protists, from Protists separately to Fungi, Plants, and Animals D. Prokaryotes to Fungi to Protists to Plants to Animals E. Prokaryotes to Protists, separately to Animals and Plants with Fungi a loss of plant photosynthesis
Which statement correctly describes the process of crossing over?
A) Pieces of a maternal chromatid break off and swap pieces with its sister chromatid, and then the same occurs between the paternal chromatids. B) Two chromatids (one maternal and one paternal) break off at corresponding points on homologous chromosomes. The pieces of chromatid rejoin to the chromosome in each other's places. C) During replication, a maternal and a paternal chromosome switch places. D) Two alleles exchange positions on a chromosome, creating new recombination frequencies. E) While homologous chromosomes are splitting apart and separating to either end of the new nucleus, two chromosomes switch positions and move toward the ends, opposite from where they were originally headed.