If an allele is inherited on the X chromosome, but not the Y, it is said to be an example of ________
A. autosomal inheritance
B. X-linked inheritance
C. chromosome theory of inheritance
D. homogametic sex
E. heterogametic sex
B
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Select the true statements describing why cladistics may not always be the best method for reconstructing phylogenies based on data from the DNA genome.
_____ The rate of evolution of the DNA genome is rapid. _____ The assumptions of the principle of parsimony are not always met. _____ Homoplasy often dominates the data sets. _____ The number of character states for DNA is large.
Reversible reactions in a cell rarely reach equilibrium because
a. the products are generally reactants in other reactions and are thus immediately used. b. a cell at equilibrium is dead. c. most reactions in a cell are not reversible, allowing the cell to devote additional resources to regulating the few reversible reactions that do occur. d. cells have no way of measuring the relative ratios of reactants and products. e. conditions in the cell change too rapidly for any reaction to ever reach equilibrium.
Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?
A) calcium B) iodine C) sodium D) phosphorus
The synthesis of sugar molecules through the process of photosynthesis requires energy absorbed from sunlight. Bearing this in mind, what kind of reaction is photosynthesis?
A. catabolic B. exergonic C. feedback D. endergonic