A eukaryotic cell has a nuclear envelope that allows tRNA molecules, but not mRNA molecules, to leave the nucleus. Which of the following processes will not be able to take place in this cell?
A) DNA replication
B) tRNAs binding to codons
C) RNA being made from DNA
D) tRNAs binding to amino acids
Answer: B
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You may have heard about Kopi luwak coffee, produced from coffee beans collected after passing through the digestive tracts of animals known as civets. Why might the coffee plant have developed fruit that would be ingested by civets?
Select all correct choices. A. Passing through the civet digestive tract causes vernalization of coffee seeds. B. Passing through the civet digestive tract helps in the dispersal of coffee seeds. C. Passing through the civet digestive tract activates the photoreceptors of coffee seeds. D. Passing through the civet digestive tract helps coffee seeds germinate.
Carbon and hydrogen make up many biologically important molecules. Carbon has an electronegativity of 2.55, whereas hydrogen has an electronegativity of 2.2. Based on the electronegativity difference between the atoms, the carbon and hydrogens shown here have just formed
A. an ionic bond.
B. a hydrogen bond.
C. a polar covalent bond.
D. a nonpolar covalent bond.
E. an element.
_______ muscle is the muscle usually found in the walls of blood vessels and is important for regulating blood pressure.
A. Cardiac B. Skeletal C. Smooth
Which of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA?
A) synthesis of DNA from an RNA template B) synthesis of double-stranded RNA from an RNA template C) synthesis of double-stranded RNA from a DNA template D) transcription of mRNA from DNA E) synthesis of DNA from a DNA template