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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

When an enzyme linked receptor is activated, a conformational change activates the extracellular

kinases. __________________ Indicate whether the statement is true or false.

Biology & Microbiology

Identify and naming of organisms is

A. Paleontology B. Cytology C. Grouping D. Taxonomy E. Classification

Biology & Microbiology