The specimen for an electron microscope is always
A. sliced into thin sections
B. viewed directly
C. killed.
D. stained with dyes.
C. killed
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Except for the regions at its tips where it is homologous to the X chromosome, genes on the Y chromosome:
A. are completely linked. B. are mostly completely linked, but a few exhibit independent assortment. C. are mostly completely linked, but a few exhibit random segregation. D. may or may not be linked; it just depends on how far apart they are from one another. E. may or may not be linked; it just depends on the individual alleles of the gene.
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labeled viruses that
insert their double stranded DNA into the DNA of the cells that they infect. The viral DNA is then treated as part of the cell's own DNA and is replicated during DNA replication and passed onto daughter cells when the cell divides. You infect a population of cells with the 32P-labeled viruses, and then let the infected cells go through two generations of cell divisions. If you then examine the cells, you should find 32P-labeled DNA in ____ of the cells.
a. none b. about 1/4 c. about 1/2 d. about 3/4 e. all
If the mRNA codon for proline can be CCU, CCC, CCA, or CCG, an mRNA strand to encode for the use of proline in a protein could be
A. GGG. B. GGA. C. CCC. D. All of these answers are true.
After the mordant has been added, Gram-positive organisms are stained ________ and Gram-negative organisms are stained ________.
A. purple; purple B. purple; colorless C. purple; pink D. pink; pink