In the bacterial nitrogen economy, is any group(plant,symbiotic nitrogen-fixing bacteria) working for free?
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A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. amniocentesis. B. genetic counseling. C. chorionic villi sampling. D. a pedigree analysis.
The Lac repressor:
A. binds to the Lac promoter. B. only binds specifically to DNA. C. functions as a dimer. D. functions as a tetramer. E. prevents bending of DNA.
Although Dolly was only three years old, her chromosomes had the length of a 9-10 year old sheep. Which of the following best describes why this occurred?
A. The cell lines that created Dolly were aged prematurely in the lab B. Nonhomologous recombination C. A mutation enhanced the rate of aging D. Dolly was not a clone E. The telomeres of the somatic cells that Dolly originated from were shortening
T cells are responsible for directly manufacturing antibodies
Indicate whether this statement is true or false.