The conjugation bridge in an Hfr × F- mating usually breaks before chromosome transfer is complete; however, because at least part of the plasmid is transferred first, the recipient becomes F+.
Answer the following statement true (T) or false (F)
False
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There are greenhouse gases other than CO2, including methane (CH4) and nitrous oxide (N2O), which have potential to influence changes in Earth's climate
Compare the graphs shown below measuring CO2 levels and N2O levels in the atmosphere between 1978 and 2010. CO2 plays a role in the carbon cycle, whereas N2O is a product of the nitrogen cycle. The latter results primarily from agricultural practices that utilize nitrogen-based fertilizers. Because N2O stays in the atmosphere for about 120 years before undergoing a biochemical conversion or being removed by a reservoir, the impact of one pound of N2O on the warming of Earth's atmosphere is over 300 times that of the equivalent amount of CO2 http://www.epa.gov http://www.epa.gov. Thus, it becomes important to understand atmospheric gas trends and take these results into account when making decisions about human activities detrimental to Earth's climate. Reference: Ref 25-6 While both graphs show an upward trend, N2O levels (right panel) do not oscillate annually like CO2 levels (left panel). What may account for this difference? Select all plausible choices. What will be an ideal response?
A screening system called the ________ test is used for detecting chemicals with carcinogenic potential.
A. Iowa B. mutation C. Ames D. Koch E. cancer
Sickle-cell disease is a recessive genetic disease. This means
A. at least one copy of each recessive allele must be present for each gene involved in sickle-cell disease in order for the disease to be expressed. B. two copies of the recessive allele must be present in order for the disease to be expressed. C. the environment can alter the expression of recessive genes, meaning any combination of alleles can cause the disease if the right environmental conditions are encountered. D. only one copy of the recessive allele must be present in order for the disease to be expressed.
Sexual reproduction _____________________.
A. leads to uniform characteristics within a population B. results in new combinations of genetic traits C. creates genetic clones D. requires less tissue differentiation than asexual reproduction E. produces genetic clones and requires less tissue differentiation than asexual reproduction