A species of insect that lives solely on pine sap was found to contain a bacterial symbiont
Genome sequencing of both the host and the symbiont revealed that the symbiont lacked many genes required for energy production, and the host lacked genes for biosynthesis of several essential amino acids. What is/are the most likely mechanism(s) that caused the loss of these genes?
A) coevolution
B) horizontal gene transfer
C) increased mutation rate
D) horizontal gene transfer and increased mutation rate
Answer: A
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Which of the following is not a component of a nucleotide?
A. a five-carbon sugar B. one or more phosphate groups C. a nitrogen-containing base D. a carboxyl group E. a five-carbon sugar, one or more phosphate groups, a nitrogen-containing base and a carboxyl group are all components of nucleotides.
Phenotype is ____
a. only expressed in a heterozygous organism b. an observable property or expression of a trait in an organism c. the specific genetic constitution of an organism
d. the variation of genes e. cannot be determined by knowing genotype
Which plants are often the dominant land plants in cool temperate zones, especially in areas with poor soils?
a. gymnosperms b. ferns c. angiosperms d. bryophytes
Which of the following limitations of the linear probability is not problematic in the event that the only treatment variable in your regression (X or right-hand side), is a binary variable?
A. The errors of the model have to be homoscedastic. B. The errors of the model have to be heteroscedastic. C. The predictions might not fall between zero and 1. D. The coefficients might be negative.