Our cells have 23 pairs of chromosomes to replicate for cell division. While picking apples in the orchard, you accidentally cut your hand on a sharp twig. Your skin must make new cells to heal the cut. What part of the cell cycle is shown and how many pairs of chromosomes are in the new formed cells? a S- duplication of the DNA, 23 pairs chromosomes b G2 Checkpoint- checking cell size and DNA replication, 46 pairs of chromosomes c G1 Checkpoint- checking cell size and for enough proteins, 46 pairs of chromosomes d M-complete cell division, 23 pairs chromosomes

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Which statement best describes lactic acid fermentation? a. lactic acid fermentation is the first step of cellular respiration. o b. lactic acid fermentation is the final step of cellular respiration. re to berate c. in the absence of oxygen, cells release atp by breaking down lactose into glucose. e der lade res o d. in the absence of oxygen, cells release atp by breaking down glucose into lactate. ar

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.