Which of the following statements is true?
A) The linkage ratio is best seen in genes on nonhomologous chromosomes.
B) Linkage without crossing over leads to all recombinant chromosomes.
C) A centromere and its surrounding genes constitute a linkage group.
D) The chromosomal theory of inheritance denotes that linked alleles will never be separated.
E) If two gene loci are on nonhomologous chromosomes, genes at these loci are expected to assort independently.
Answer: E
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A team of researchers is studying the external structures on the dorsal (back) surface of a spider mite. The spider mite seems to be the habitat of an even smaller mite, which is approximately 0.05mm. While they can see the dorsal surface of the spider mite with their naked eye, they cannot see the mite clearly. The researchers are writing a grant to provide support for a microscope to use to
study these new mites. They need to purchase a microscope with a high magnification to observe the new mites on their habitat. Based on the information given, what type of microscope would you suggest? A. scanning electron microscope B. no microscope is powerful enough to see the smaller mite C. binocular compound light microscope D. transmission electron microscope
Each of the following small molecules easily diffuses through the cell membrane EXCEPT ____
a. steroid hormones b. O2 c. H2O d. glucose e. CO2
Great swamp forests covered the globe and formed the major coal deposits during the:a
Jurassic period. b. Eocene epoch. c. Carboniferous period. d. Precambrian. e. Ordovician period.
What are on the surface of most vertebrate cells, acting as markers of "self"?
A. T-cell receptors B. Major histocompatibility complex proteins C. Immunoglobulins D. Antigens