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Explain how radiocarbon dating would be used to determine the age of a piece of Pleistocene wood. In this description, include a discussion of the specific parent and daughter isotopes used to date wood, how those isotopes are generated in the upper atmosphere, and how do these isotopes get into living tissue of plants and animals. When does the radiometric clock start ticking? Explain how this is used to determine the age by describing the concept of a half-life. Use an example with a specific number of isotopes and elapsed half-lives, such as if 1/8 (12.5%) of the parent isotope is left, and the half-life is 5,730 years, then how old is the wood?
In watermelons, the genes for green color and for short shape are dominant over their alleles for striped color and for long shape. Suppose a plant with long striped fruit is crossed with a plant that is heterozygous for both of these characters.
1. Record the classes for each of the following arthropods, as determined from the dichotomous key
In an electrophilic aromatic substitution reaction, does the aromatic ring act as an electrophile or a nucleophile? Please show the first step
You receive a set of pregnant brown mice. You know that the mothers are doubly heterozygous (heterozygous at both the coat color and albinism loci) and that the fathers were albino.
Which of the following levels of protein structure is not important for the overall shape of a protein?
What are the three levels of regulation of gene expression? How do they differ from each other? What are the major mechanisms used at each level?
In rabbits, black hair is due to a dominant gene; brown is recessive allele. Short hair is due to a different dominant gene carried at a location o a different chromesome.
A suspension is formed from uniform particles of solid, of diameter 10 Mm, suspended in a solvent. What is the best description of this system?
Mammals contain a diploid genome consisting of at least 109 bp. Each group of 200 bp of DNA is combined with 9 histones into a nucleosome.
What is the name of the process where a single species separated by a barrier result in two new species.
What does green growth on an Eosin methylene blue plate indicate and which two organisms are known to be able to do this?
What are the different routes that pathogenic protozoans can use to enter the host?
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