Which offspring inherit all their mitochondrial DNA from their mother and none from their father?
A. daughters
B. sons
C. both sons and daughters
D. neither sons nor daughters
C. both sons and daughters
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Which of the following has the greatest total
energy? a. cAMP b. ADP c. ATP d. glucose e. NADPH
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. While there is reduced fertility in both sexes, females have higher fertility than males. Van Dyke et al. (1995; Down Syndrome
Research and Practice 3(2 ): 65-69 ) summarize data involving children born of Down syndrome individuals. Given the fact that conceptuses with 48 chromosomes (four #21 chromosomes) are not likely to survive early development, what percentage of surviving offspring would be expected to have Down syndrome if both parents have Down syndrome? A) One-third of the surviving offspring would be expected to have Down syndrome. B) All the children would be expected to have Down syndrome. C) One-half of the surviving offspring would be expected to have Down syndrome. D) Two-thirds of the surviving offspring would be expected to have Down syndrome. E) None of the surviving offspring would be expected to have Down syndrome.
The absorptive epithelia in the gut are considered "polarized" because _____
A) thick and thin filaments are present B) they pump wastes into the lumen while pumping nutrients toward the blood C) the colors seen on the top and bottom of the cells are different D) they must fire action potentials to absorb most nutrients E) the apical surface is different from the basal surface
The current mass extinction is said to be 100 to 1000 times above the background extinction rate
What does this mean? What will be an ideal response?