All of the following pertain to nitrogenous bases except
A. they form pairs by hydrogen bonding.
B. cytosine and thymine are pyrimidines.
C. adenine pairs with thymine.
D. guanine pairs with uracil.
E. they allow variation from one nucleotide to another which creates the encoded information.
Answer: D
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If nondisjunction occurs in an egg cell and the resulting egg is short a chromosome number 21, what will happen after fertilization?
1.The child will be born with Down’s syndrome. 2.The child will be born normal. 3.The zygote will not develop and will result in a miscarriage. 4.Fertilization cannot take place since there are not enough chromosomes.
Why are some proteins more likely than others to diverge within a species?
What will be an ideal response?
All of the following statements concerning the evolutionary species concept are true EXCEPT
A. an evolutionary "family tree" is used to identify species based on a common ancestor. B. it relies on identification of certain morphological traits to distinguish one species from another. C. abrupt changes in traits are indicative of the evolution of a new species in the fossil record. D. it requires that the members of a species share a distinct evolutionary pathway.
The chemical composition of urine reflects the processes of
What will be an ideal response?