The scientific work that established DNA, rather than protein, as the molecule of heredity was performed prior to
A) Mendel's work on heredity.
B) the elucidation of the double helix structure of DNA.
C) Antonie van Leeuwenhoek's observation of internal cell structures.
D) the description of the enzymatic steps of glycolysis.
E) the formation of the chromosome theory of heredity.
Answer: B
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Which one of the following is nottrue of tRNA molecules?
A. tRNA molecules are single-stranded RNA. B. The 3'-terminal nucleotide of tRNA is the site of amino acid attachment. C. The anticodon arm of tRNA contains a three nucleotide sequence that is identical to a specific mRNA codon. D. tRNA molecules contain the unusual nucleotides dihydrouridine, pseudouridine, and ribothymine.
Answer the following statements true (T) or false (F)
1. The root hairs develop in the zone of elongation. 2. The direction in which a plant cell expands depends on the arrangement of cellulose microfibrils in its cell wall. 3. Flowers develop as a result of determinate shoot growth. 4. The expression "one bad apple spoils the whole bunch" probably has to do with the action of ethylene on fruit ripening.
A pile of castings outside the burrow of a polychaete indicates it
a. has just dug a burrow. b. has completed a meal of other worms. c. is a filter feeder. d. is a selective deposit feeder. e. is a nonselective deposit feeder.
What is the mitochondrion's function in the cell?
a. protein synthesis b. cellular respiration and ATP production c. lipid packaging for export from the cell d. cellular water balance regulation