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A population of birds colonizes an area in which the insects upon which they feed live inside trees. Which of the following events accounts for an observed increase in average beak size in the bird population over time?
1) Decreased fitness of small-beaked birds, creating a new species
2) Increased fitness of the large-beaked birds, creating a new species
3) Increased fitness of large-beaked birds, leading to natural selection
4) Decreased fitness of the insects, allowing the birds to catch them more easily
Comb shape in chickens represents a classic example of gene interaction. 2-gene pairs interact to influence shape of the comb. The genes for rose com and pea comb together produce walnut comb.
Experiments with erythrocyte "ghosts" were carried out to learn more about the glucose transporter in red blood cells. "Ghosts" are prepared by lysing red blood cells in a hypotonic medium and washing away the cytoplasmic contents.
Estimate the value of the turnover number of the enzyme invertase, given that Rmax (Vmax) for invertase = 15.8 mmol·L-1·min-1 and [E]t = 4.8 ?
You obtain the pigments called carotenoids in your diet when you eat carrots. Why do carotenoids appear yellow and orange?
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 35 ears in 1/1000 of an acre. He determines that each ear has about 500 kernels on average. He also knows that a bushel contains about 97,..
Fats in the diet have satiety value they stay in stomach longer so we feel fuller longer. Fats provide protective coatings on the body surfaces to help prevent dehydration. Lipids - 2 what are the main categories of lipids found in humans.
As glucose is metabolized during respiration, a number of intermediate products are generated. Discuss how some of these intermediates are used to produce some of the essential biological molecules for the organism.
Which organism can cause food-borne intoxication.
Diagram and explain how xylem sap & phloem sap are transported in plants. There are several diagrams in the book showing different parts of the overall process.
There they discover his mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best description of his condition.
use chi square analysis to test your model - how could you explain this inheritance at the molecular level.
After one minute, ask your subjects to close their eyes. Once their eyes are closed, ask them to recite everything in the room that is different colour than the one they were looking for, for in case, anything and everything that is green.
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