Which of the following nitrogenous bases is NOT found in molecules of DNA?
a. adenine
b. guanine
c. uracil
d. thymine
e. cytosine
Answer: c. uracil
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Which of the following statements about El Niño are true?
_____ Occurrence of El Niño is irregular and unpredictable. _____ The immediate effect of El Niño is a weakening in the east-to-west trade winds _____ Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast. _____ El Niño results in the movement of weather systems from the western Pacific eastward. _____ El Niño events in the Pacific can influence weather as far away as Africa.
Select all components of rod cells of the retina.
A. rhodopsin embedded in disks B. inner and outer segments C. synaptic vesicles D. all of the above
When an enzyme linked receptor is activated, a conformational change activates the extracellular
kinases. __________________ Indicate whether the statement is true or false.
Identify and naming of organisms is
A. Paleontology B. Cytology C. Grouping D. Taxonomy E. Classification