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You are a biologist working in Montana when you find a fossil wedged between two ancient layers of sedimentary layers. What technique would be the best tool to use to find the age of the fossil?Answer1. Use the radioisotopes sandwiched into the two layers around the fossil to approximate the range of time that the organism was alive.2. Use carbon dating of the fossil's carbon 12 isotopes.3. Use radioactive dating of the fossil's uranium-238 isotopes.4. Use the ratio of carbon-12 to carbon-14 isotopes in the fossil to approximate the time the fossil was formed.5. Use carbon dating of the fossil's carbon 14 isotopes.
Which of the following facts or phenomena likely represent the most alarming evidence warning of an ongoing sixth mass extinction event?Answer1. The thoroughly documented extinction of species in the rainforest.2. That we are currently in an ice-age.3. The likelihood of an asteroid striking the earth.4. The fact that polar bears and grizzly bears are now interbreeding.5. That previous extinctions rates increased with increased global temperature.
People who live at high altitudes often have a high red blood cell count, a condition called polycythaemia. Explain the cause of the polycythaemia and its possible benefit. Do you think it could have adverse effects? Explain!
Explain how this exchange of materials helps support homeostasis within the cell, and allows for life functions within the cell.
Determining genotypes in autosomal dominant pedigrees. From the list on the left hand of the picture are the choices for the blanks with arrrows.
In order to perform a fluorescence experiment, you need to seed a 4-well chamber slide with 60,000 cells in each well. To prepare for the cell count, you transferred twenty uL of cell suspension into thirty uL of trypan blue.
Which of the following is TRUE about the initiator tRNA?
Calculate the size of the smallest resolvable object if 600-nm lightis used to observe a specimen with a 100oil-immersion lens having a numerical aperture of 1.32. How could resolution be improved using this same lens?
Recessive mutant alleles of an x-linked gene in Drosophila, crossveinless, prevent the development of supporting structures in the wings.
Explain why dihybird crosses of yeast always results in predicted phenotypic ratio but results of similar two crosses in eukaryotic organisms
Imagine that you could design a version of phosphofructokinase that failed to bind AMP. How would replacing normal phosphofructokinase with this redesigned version affect the response.
Dry yeast was mixed in water one hour before lab started. You mixed the yeast slurry with either water or a sucrose solution and placed the mixture in a fermentation tube at the start of lab.
After phagocytosis of a pathogen, the phagosome becomes very acidic with the pH dropping to between 3.5 and four. However, some of the enzymes are important to kill pathogens only work when the pH is higher than five.
Luisa is swinging on a playground swing at school. A teacher facing her blows a whistle to let the children know recess is over. As Luisa swings, what does she hear? When does she hear the highest pitch?
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