Chlorosis in plants is a condition best explained by:
A. lack of water
B. lack of certain minerals
C. lack of oxygen
D. lack of carbon dioxide
E. lack of soil moisture
B. lack of certain minerals
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When the DNA sequence of the gene that codes for the peptide hormone insulin is compared in two mammals (e.g., humans and rats), most of the sequence differences are silent mutations
These far outnumber sequence differences that result in amino acid substitutions. Why might this be? A. Mutations are random with respect to an organism's needs. B. Amino acid substitutions often result in proteins that have lost or compromised function, and so are selected against. C. A DNA sequence is more likely to mutate if the change does not alter the amino acid sequence. D. Most amino acid substitutions result in a beneficial phenotype that improves fitness and results in a greater number of offspring. E. Silent mutations occur in noncoding DNA sequences.
An early attempt by Cohn at bacterial classification grouped bacteria according to their
A. biochemistry. B. Gram stain. C. shape. D. arrangement.
Which phylogenetic model proposes that the first eukaryotes originated from a pool of many species of prokaryotes engaged in multiple methods of horizontal gene transfer?
a. tree of life b. ring of life c. web of life d. cloud of life
In an experiment, the control group
a. is not subjected to experimental error. b. is exposed to experimental treatments. c. is identical to the one being tested except for the variable being studied. d. is treated exactly the same as the experimental group, except for the one independent variable. e. is statistically the most important part of the experiment