You have discovered a gene that appears to be crucial to the development of the nervous system in C. elegans. However, you have been unsuccessful in creating embryos in which this gene is knocked out. How might you study the function of this gene in C
elegans without creating a "knockout" mutant?
A) CRISPR/Cas targeted gene disruption
B) RNAi gene knockdown
C) transcriptional activator-like effector nucleases (TALENs) targeted gene disruption
D) next-generation sequencing.
E) restriction endonuclease mapping.
Answer: B
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Photosynthesis ceases when leaves wilt, mainly because _____
A) the chlorophyll in wilting leaves is degraded B) flaccid mesophyll cells are incapable of photosynthesis C) stomata close, preventing carbon dioxide from entering the leaf D) photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency E) accumulation of carbon dioxide in the leaf inhibits enzymes
Which of the following is true about the chemical bonds found in proteins and nucleic acids?
A. Covalent bonds result when an electron is completely transferred to another atom such that the atoms are drawn together by electrostatic charges. B. Ionic bonds result when two atoms share electrons equally. C. Atoms having a small difference between their electronegativities are more likely to form covalent bonds. D. Ionic bonds are most likely to form between two metal atoms. E. The strength of a covalent bond can vary with the salt concentration of the environment.
Watson and Crick describe the relationship between ________ as a directional flow of information called the "central dogma".
A) nucleic acids and proteins B) enzymes and proteins C) peptides and polypeptides D) DNA and RNA
The ____ in the bird's digestive tract is utilized for food storage
a. crop b. esophagus c. gizzard d. intestine e. mouth