For an individual Drosophila melanogaster fly the time from when it is laid as an egg to when it is an
adult capable of breeding is about ____.
a. 3 months
b. 2 days
c. 6 weeks
d. 10 days
e. 1 month
D
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Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. A polar amino acid to a non-polar amino acid within a transmembrane domain B. A non-polar amino acid to a polar amino acid within a transmembrane domain C. A polar amino acid to a non-polar amino acid within a cytoplasmic domain D. A non-polar amino acid to a polar amino acid within a cytoplasmic domain Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the amino acids found in a transmembrane domain? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The scientist(s) given credit for first determining the molecule structure of DNA by building a ball-and-stick model was/were
A. Hershey and Chase. B. Avery and Macleod. C. Griffith. D. Watson and Crick. E. Chargaff.
Answer the following questions true (T) or false (F)
1. Peroxisomes contain enzymes used to digest nutrients that have been brought into the cell through phagocytosis. 2. Bacterial protein synthesis can begin before the reading of the gene is complete. 3. Archaea are similar to bacteria in having cytoplasmic membrane that are composed of phospholipids and hopanoids.
Transmission and scanning electron microscopy differ because
A. transmission electron microscopy has much higher magnification than scanning electron microscopy. B. transmission electron microscopy shows contrast, but scanning electron microscopy does not. C. transmission electron microscopy shows two-dimensional ultrastructure, while the scanning electron microscopy shows three-dimensional structure. D. transmission electron microscopy uses light as an illumination source, while scanning electron microscopy uses electron beams as an illumination source. E. transmission electron microscopy has high resolution, but scanning electron microscopy does not.