A microscope that exposes specimens to ultraviolet, violet, or blue light and forms an image with the light emitted at a different wavelength is called a ________ microscope.
A. fluorescence
B. scanning electron
C. dark-field
D. phase-contrast
Answer: A
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Imagine you wanted to use a human genomic DNA library to clone the human gene for insulin. You will be using the rat insulin gene sequence as your DNA probe. In what order would you perform the following steps to accomplish this goal? 1
Use autoradiography to identify colonies containing DNA that hybridized to the probe 2. Grow transformed cells on media with antibiotics and X-gal for blue-white screening 3. Ligate genomic DNA and vector DNA 4. Cut genomic DNA and vector DNA with restriction enzymes 5. Hybridize library DNA with labeled probe for the rat insulin gene 6. Transform bacteria with recombinant plasmid A) 2, 3, 6, 5, 4, 1 B) 1, 2, 5, 6, 4, 3 C) 4, 3, 6, 2, 5, 1 D) 4, 3, 5, 2, 6, 1 E) 2, 6, 5, 3, 1, 4
In your research, you have discovered that Protein X is often ubiquitinated in people with a certain disease. What would you predict about levels of Protein X in these patients?
A. Levels of Protein X will be the same, just carrying a ubiquitin tag. B. Levels of Protein X will be decreased due to negative feedback on transcription. C. Levels of Protein X will be increased due to protection from degradation. D. Levels of Protein X will be increased due to transcriptional activation. E. Levels of Protein X will be low due to degradation in the proteasome.
Stem cell transplants may someday be used to treat Parkinson's disease. Researchers are hopeful that these cells would alleviate the symptoms of Parkinson's disease by _____
A) preventing temporal lobe seizures B) repairing sites of traumatic brain injury C) replenishing missing ion channels D) secreting the neurotransmitter dopamine
Which of the following statements best represents the theory of pangenesis developed by Hippocrates?
A) Pregnancy is a spontaneous event, and the characteristics of the offspring are determined by the gods. B) Particles called pangenes, which originate in each part of an organism's body, collect in the sperm or eggs and are passed on to the next generation. C) Offspring inherit the traits of either the mother or the father, but not both. D) Heritable traits are influenced by the environment and the behaviors of the parents.