An advantage of conifer needles is
a. a decreased rate of photosynthesis.
b. an increased rate of photosynthesis.
c. that they are shed annually.
d. water conservation
D
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Review Figure 19.15 below: Which one of the following statements about mutations in the lactose operon is not correct?
A. A lacI mutant would result in the loss of expression of repressor protein. B. A lacI mutant would allow continuous or constitutive expression of both -galactosidase and lactose permease. C. A mutation in the lacO sequence would allow continuous or constitutive expression of both -galactosidase and lactose permease. D. In cells containing one mutant and one normal copy of lacI, the repressor is still expressed and lacZ and lacY will be expressed only in the presence of lactose. E. In cells containing one mutant and one normal copy of lacO, lacZ and lacY are expressed only in the absence of lactose.
An unrooted tree containing four unrelated species can become rooted by adding
A. a descendant group related to two of the species. B. an unrelated outgroup. C. a descendant related to only one of the species. D. a distantly related outgroup.
Of the following factors, which is/are used to classify marine organisms as plankton, nekton, or benthos? Choose all that apply.
What will be an ideal response?
1n is an abbreviation for
A. haploid. B. somatic cells. C. diploid. D. mitosis. E. meiosis.