Which lineage of Echinoderms is made up of about 600 living species of sea lilies and feather stars?
a. Asteroidea
b. Crinoidea
c. Holothuroidea
d. Ophiuroidea
Ans: b. Crinoidea
Biology & Microbiology
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A cadherin protein can only bind to:
A. another cadherin. B. another cadherin of the same type. C. the extracellular domain of the same type of cadherin. D. the extracellular matrix.
Biology & Microbiology
Which of the following nitrogenous bases is NOT normally found in DNA?
a. thymine b. cytosine c. adenine d. uracil e. guanine
Biology & Microbiology
The plant hormone that promotes fruit ripening is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.
Biology & Microbiology
Which discovery was determined about DNA from x-ray diffraction data?
A. DNA is uniform in length. B. DNA is short and narrow. C. DNA has a repeating pattern. D. DNA molecules are flat. E. DNA molecules are round.
Biology & Microbiology