Which of the following statements about plant development is true?
A. A single gene is responsible for the control of all root and shoot formation.
B. Cells nearest to the suspensor ultimately form the root.
C. The radial axis of the developing embryo develops before the root-shoot axis.
D. Gibberellic acid is important in root-shoot axis formation.
E. The MONOPTEROS gene (MP) stimulates chlorophyll synthesis in seeds.
Answer: B
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Chemical synthesis of DNA:
A. requires attachment of a starting nucleotide to a glass or polystyrene bead through its 5' phosphate. B. proceeds in the 5' to 3' direction. C. requires transient protection of the nucleotide's functional groups by chemical modification.These protective modifications are reversible. D. requires that the chemical group used to protect the 3'OH of the pentose is removed at the beginning of each cycle. E. can be used to synthesize small chains of nucleotides up to 10 bases.
A radioactively labeled protein is made by cells and followed through the various organelles in the secretory pathway. After six hours, all of the radioactivity is still primarily in the Golgi apparatus. This suggests that the
A) protein was not translated by the ribosomes. B) protein does not possess a signal peptide for localization within the lumen of the rough endoplasmic reticulum. C) protein possesses a signal for localization within the Golgi apparatus. D) all of the above
Which of the following does an insect use to excrete
metabolic wastes from the body? a. nephridium b. flame cell c. trachea d. Malpighian tubule e. siphon
A child is born with a lethal dominant allele. This would seem to be impossible since either parent,
had they possessed this allele, would have suffered its lethal effects. What is a possible explanation? A. The child's allele is a spontaneous mutation that neither parent had to deal with. B. The allele could have varying expressivity and not always be lethal. C. The allele could have delayed onset. D. All of these are possible. E. None of these is possible.