In Engelmann's 1882 experiment, why did bacteria cluster in red or blue wavelengths of light?
a. The bacteria used those wavelengths to photosynthesize.
b. Algae photosynthesized best at those wavelengths, producing needed oxygen.
c. The bacteria produced oxygen most efficiently using red and blue light.
d. Algae photosynthesized best at those wavelengths, producing needed carbon dioxide.
e. The bacteria were attracted to bright light.
b
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Which of the following is NOT a natural means of DNA recombination?
A) Viral infection B) Transformation in bacteria C) PCR D) Sexual reproduction
What is the relationship between operons and transcription units?
a. They are synonymous terms. b. An operon consists of a transcription unit plus associated regulatory DNA sequences. c. A transcription unit consists of an operon plus associated regulatory DNA sequences. d. An operon is composed of multiple transcription units. e. A transcription unit is composed of multiple operons.
Suppose that the first part of a new polypeptide chain being produced in a eukaryotic cell has a signal
peptide. Which of the following would you associate with the location of translation to form that polypeptide?
a. cytoplasm only b. first cytoplasm, then rough ER c. Golgi apparatus only d. first rough ER, then Golgi apparatus e. rough ER only
What is the structure of the large polytene chromosomes found in some tissues of dipteran larvae?
What will be an ideal response?