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Q1. If substance is less concentrated outside a cell than inside the cell in which direction is that substance probable to diffuse across the cell membrane?
Q2. A clinical microbiologist makes serial dilutions of several antimicrobials in broth, and then incubates each drug dilution series with a standard amount of a patient's isolated pathogen. What is this micro biologist setting up?
Q3. In birds, sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms, except that the system is reversed: Males are ZZ (similar to XX in humans) and females are ZW (like to XY in humans). A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons. What will be the sex ratio in offspring of a cross between a male heterozygous for the lethal allele and a normal female?
Diploid nuclei of the ascomycete, Neurospora crassa, contain 14 chromosomes. A single diploid cell in an ascus will undergo one round of meiosis, followed in each of daughter cells by one round of mitosis, producing a total of eight ascospores.
If populations are sustaining growth at r = 0.088 and the population in 2001 is 3000 individuals, in what year would snow geese be taken off an endangered species list.
What are the expected frequencies of three phenotypes (bald, red hair, yellow hair) in the male offspring of this cross? Imagine we observe 50 percent bald, 42 percent yellow hair, and 8 percent red hair. What is a recombination fraction between the ..
Monarch butterfly populations are found east and west of Rocky Mountains. How can DNA fingerprinting technology be used to establish that they constitute one breeding population or two separate breeding populations.
Distinguish between mechanical advantages and disadvantages in lever systems and find out which kind of lever the doctor was using to test quadriceps muscle.
Give an instance of a successful plant disease forecasting system and explain how it works. How plant diseases could be forecasted and what are the needs for that.
How does the net amount of energy released during the breakdown of sucrose compare between spontaneous reactions and catalyzed by sucrase.
If a long-haired black male is crossed with a tortoise-shell female heterozygous for hair length what kind of kittens would be produced in the F1? If the F1 cats are allowed to generously interbreed among themselves, what are chances of obtain long-h..
Explain how black and white pattern on the male siamese cat arises. If the oceans warm a few degrees, what impacts can you see on the landmasses, biologic community, and human populations? Are these positive or negative changes? Why with reason.
What is a polar molecule? Hydrogen bonding? Describe the high surface tension of water. How is this related to the proper function of the pleural serous membranes.
What is nonassociative learning and what are the differences between associative and nonassociative learning. In the small stream, you choose a rock and observe many small, flattened worms crawling on it are under surface. You decide that they belong..
Two species of garter snakes live in the same geographic area. One generally lives in water and the other mainly on land, so that they rarely encounter each other and do not interbreed. This is an example of what category of genetic isolation.
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