Why does genetic imprinting inhibit parthenogenesis?
What will be an ideal response?
ANS:
Genetic imprinting is the differential expression of genes as determined by their parental origin; generally the alleles inherited from one parent are turned on, whereas the alleles from the other are turned off. In partheno-genesis, offspring only have a mother. If the mother's genes are imprinted so that they are off, then the off-spring may not produce all of the necessary gene products.
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Five-carbon sugars are used in the
A) biosynthesis of DNA and RNA. B) catabolic pentose phosphate pathway for carbon and energy. C) biosynthesis of DNA and RNA as well as catabolic pentose phosphate pathway. D) activation of pentoses to form glycogen for energy storage.
In a eukaryote, DNA polymerase can add up to
a. 1,000 nucleotides per second. b. 500 nucleotides per second. c. 50 nucleotides per second. d. 10 nucleotides per second. e. one billion nucleotides per minute.
A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated. After a negligible lag phase, the culture goes into exponential growth for two hours. The generation time for the bacterium is fifteen minutes. Which equation is the correct one to determine the number of cells present after two hours of log phase growth?
A. 1000 X 28 B. 1000 X 2 X 2 X 15 C. 1000 X 22 D. 1000 X 16
A fluid that accumulates as the result of an inflammatory response and contains dead phagocytes, body cells, and bacteria is commonly called ______.
Fill in the blank(s) with the appropriate word(s).