What are the two organ systems of a vascular plant body?
a. shoots and roots
b. stems and leaves
c. stems and roots
d. leaves and roots
e. leaves and flowers
ANSWER: a
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What function does a competent cell have that makes it useful in cloning experiments?
A. Competent cells resist transfection by a viral vector. B. Competent cells repair DNA strands without the aid of DNA ligase. C. Competent cells utilize transposons as a vector. D. Competent cells take up DNA from the external environment
Which of the following has the highest blood pressure?
a. right ventricle b. right atrium c. aorta d. left atrium e. pulmonary circulation
Which of these events occurred earliest in the history of Earth?
a. formation of oxygen b. first humans c. evolution of land plants, fungi, and land animals d. origin of eukaryotes e. origin of multicellularity
A nitrogenous base composed of two rings is a (purine/pyrimidine/ribose)
What will be an ideal response?