A scientist is comparing two different species that she feels are closely related. She selects two different DNA segments to compare between the two species. DNA segment "A" shows a difference of four base pairs between the two species, while DNA segment "B" shows a difference of only three base pairs. Which of the following is an accurate statement regarding the scientist's work? A. The scientist can conclude that the two species are not related after all.
B. The scientist's work must be inaccurate because the DNA segments should have had the same number of base pair differences.
C. The difference in the number of base pairs should be averaged to determine how long ago the two species diverged.
D. This work demonstrates that the rate at which DNA segments experience mutations is different for each segment being studied.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

the correct answer is sex-linked recessive.

i just took the test

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.