Which one of the following choices is true of tRNA?
A. Each tRNA binds a specific amino acid.
B. tRNAs are extremely small molecules.
C. There are four types of tRNA.
D. tRNAs carry special sequences known as codons.
A. Each tRNA binds a specific amino acid.
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Microbial symbionts are horizontally transferred by parental cells directly passing on the symbionts during meiosis
Indicate whether the statement is true or false.
Which of the following complicates the generation of an evolutionary tree?
A. vertical gene transfer B. linkage analysis C. changes in mitochondrial DNA D. carcinogens in the environment E. multiple birth (e.g., twins)
The causative agent of Lyme disease is ________.
A. Ixodes scapularis B. Borrelia burgdorferi C. Ixodes pacificus D. Borrelia hermsii E. Leptospira interrogans
Steroid hormones produce their effects in cells by _____
A) activating key enzymes in metabolic pathways B) activating translation of certain mRNAs C) promoting the degradation of specific mRNAs D) binding to intracellular receptors and promoting transcription of specific genes