Which type of bond holds the nucleotide bases together in a DNA molecule?
a. hydrogen
b. covalent
c. ionic
d. network
e. peptide
A
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Which of the following is NOT a terpene?
A. the insect repellent citronella B. the anti-cancer agent taxol C. rubber D. polyvinyl E. terpentine
Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes. 2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers. 3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule. 4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds. 5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
If a mutation occurs in a somatic cell that leads to a non-functional protein, what will happen to that somatic cell?
a. It will continue through the cell cycle as normal b. It will prevent the cell from finishing the S phase. c. It will enable the cell to fix the mutation. d. It will prevent the cell from completing the cell cycle.
Marc Spehr and his colleagues demonstrated which of the following?
a. Sperm cannot detect and swim toward attractant molecules. b. Sperm attraction can be stimulated by chemicals. c. Eggs release chemicals that attract sperm. d. Sperm can detect and swim toward attractant molecules, and sperm attraction can be inhibited by chemicals. e. Sperm can release chemicals that kill other sperm