The sterile portions of a flower are the
a. petals and pistils.
b. petals and sepals.
c. petals and carpels.
d. sepals and carpels
B
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When Kary Mullis developed his original PCR protocol, the repeated heating between cycles inactivated the DNA polymerase so it had to be added again after each cycle. How was this problem later remedied?
What will be an ideal response?
If looking to discover a new organelle, which are located inside the cell, what kind of microscope must be used?
a. brightfield microscope b. transmission electron microscope c. scanning electron microscope d. compound light microscope.
What various chemical messengers does the anterior lobe of the pituitary produce?
What will be an ideal response?
Primary xylem and phloem are produced by the
A. protoderm. B. procambium. C. leaf primordial. D. proembryo. E. ground meristem.