Common foods that we eat may contain mutagens. Indicate whether the statement is true or false
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Four of the five processes below have markedly
influenced the evolution of life. Select the exception. a. continental drift b. natural selection c. inheritance of acquired characteristics d. geological catastrophes e. asteroid impacts
The basic unit of contraction in a skeletal muscle is the:
a. myofibril b. sarcomere c. muscle fiber d. myosin filament e. actin filament
Which of the following statements is most true regarding long noncoding RNAs (lncRNAs)?
A) Some lncRNAs regulate alternative splicing. B) lncRNAs act only as posttranscriptional regulators and never as pretranscription regulators. C) lncRNAs are characteristically about the same size as sncRNAs. D) lncRNAs do not contain a 5' guanine cap or a 3' poly-A-tail. E) Some lncRNAs will decrease the activity of miRNAs.
A ___________is made of epithelial tissue and is used to secrete substances into ducts and into the bloodstream.
A. fibroblast B. gland C. adipocyte D. muscle cell E. neuroglia