In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a diploid zygote; the other fuses
with the endosperm mother cell, forming a triploid cell. Fill in the blank(s) with the appropriate word(s).
ANSWER: double fertilization
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The transition step
A. links glycolysis to the pentose phosphate pathway. B. links the pentose phosphate pathway to the Entner-Duodoroff pathway. C. links glycolysis to the TCA cycle. D. takes place in the matrix of the nucleus.
What is clonal selection with regard to B cells? How does it occur?
What will be an ideal response?
Which of the following causes DNA to wrap tightly around histones essentially shutting down transcription?
a. methylation b. acetylation c. nitrogenation d. dehydration e. carbonation
Side A is __________ to side B
a. hypertonic b. hypotonic c. isotonic d. either isotonic or hypertonic e. either isotonic or hypotonic