If a cell normally has 20 chromosomes in its diploid stage, how many will be present in each cell at the end of meiosis 2?
a. 20
b. 10
c. 40
d. 5
Answer: b. 10
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This forms a seal that prevents the movement of substances between cells, for instance from the intestinal lumen into the blood.
A. gap junctions B. tight junctions C. desmosomes D. hemidesmosomes E. focal adhesions
Hereditary nonpolyposis colon cancers (HNPCC) ____
a. are rare in the United States, but common in Europe b. begin with a mutation in the APC gene c. are caused by one-of-a-kind DNA sequences called microsatellites d. are caused by one mutation in a single gene e. are caused by several mutations in several different genes
Albinism is an example of ________
A) a dominant disease B) an autosomal recessive disease C) a sex-linked disease D) a polygenic disease
The sodium-potassium pump
a. helps establish an electrochemical gradient across the membrane. b. concentrates sodium on the outside of the membrane. c. uses a carrier protein and chemical energy. d. is present in the plasma membrane. e. All of these are correct.