Of the variance and the standard deviation for a set of data about a trait, which represents the square of the difference between each of the values and the mean of the sample, divided by the degrees of freedom?
What will be an ideal response?
variance
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Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red spot on the parent's bill, which causes the parents to open the bill and regurgitate their food
Chicks will peck at a red dot painted on any long, slender object. For the chicks, pecking is a ____ and the red dot is a ____ . For the adult gulls, the chicks pecking at their bills is a ____ and regurgitating food is a ____ . Fill in the blank with the appropriate word.
Many receptor tyrosine kinase (RTK) pathways lead to the activation of Ras. To activate Ras, it is necessary to recruit a guanine nucleotide exchange factor to the plasma membrane, because Ras is a membrane associated protein. Guanine nucleotide exchange factors, such as SOS, stimulate the exchange of GDP for GTP. However, SOS cannot bind directly to most RTKs. The protein Grb2 has a domain that
can bind to phosphorylated tyrosines, and another domain that can bind to SOS. Therefore, Grb2 can bind to active RTKs and recruit SOS to the plasma membrane. Grb2 is an example of what kind of signaling molecule? A. Scaffold B. Adapter protein C. Second messenger D. Enzyme
What is the purpose of evolution?
a. Evolution has an ultimate goal of ensuring that organisms occupy every available biological niche on Earth. b. The purpose of evolution is to produce organisms with maximum fitness for their individual environments. c. Evolution does not have a goal; it is simply a description of the forces that influence a population’s genes over time. d. Evolution is intended to design organisms that are beneficial for humans and advance human civilization.
________________ is defined as an organism's expressed physical traits.
a) Phenotype b) Genotype c) Heritable trait d) None of the above