Of the following choices, the epithelium with the shortest diffusion distance is _____
A) simple squamous epithelium
B) simple columnar epithelium
C) pseudostratified ciliated columnar epithelium
D) stratified squamous epithelium
A
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The fruitfly cross shown here analyzes the transmission of two genes on the X chromosome. In the parental generation, the male parent carries mutant alleles for both the white gene (w) and the crossveinless gene (cw)
The female parent carries nonmutant forms of these genes. A cross between siblings of the F1 generationâ€"a red-eyed, crossveined female and a red-eyed, crossveined maleâ€"generates F2 progeny. Examine the genotype of the F2 male progeny. Notice that the progeny fall into two groups. Refer to this figure when answering the following question: The numbers of male F2 progeny with each of the four observed phenotypes are as follows: Red-eyed, crossveined = 357 White-eyed, crossveinless = 341 Red-eyed, crossveinless = 52 White-eyed crossveined = 45 What is the map distance between the two genes w and cw? A. 97 B. 12.2 C. 341 D. 357 E. 13.9
We know that carbon dioxide levels were in the atmosphere millions of years ago through ____
a. radioisotope dating b. measuring carbon dioxide levels in fossil fuel samples c. measuring carbon isotope ratios in fossil fuel samples d. measuring carbon dioxide levels in air pockets in ice cores e. measuring carbon isotope ratios in air pockets in ice cores
____________________ are short nucleotide sequences used to begin replication in PCR, and to
which the polymerase adds nucleotides. Fill in the blank(s) with the appropriate word(s).
The newest issue of your favorite science magazine has an article about several recently discovered archaeans. These organisms were found living in swamp mud. Based on this information, these archaeans are probably halophiles.
Answer the following statement true (T) or false (F)