Describe the process of double fertilization in flowering plants
What will be an ideal response?
ANSWER: In flowering plants fertilization is typically a double event. In one event a single sperm
joins with a single egg, creating a diploid cell that will become the embryo. In the other
event a single sperm joins with the central cell of the embryo sac; the central cell begins
with two nuclei, so this joining produces a triploid cell. This triploid cell gives rise to
endosperm, a tissue that provides nourishment for the developing embryo.
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You are planning to perform some protein-protein interaction studies to identify a receptor for a steroid hormone you have been working on. You start by fractionating the cell. What cell fraction would you want to work with to identify the steroid hormone receptor of interest?
A. The plasma membrane fraction B. The extracellular fraction C. The cytoplasmic fraction D. The mitochondrial fraction E. The ribosomal fraction
Probably the most abundant carbohydrate on Earth, which unbranched chain of b-glucose subunits is the primary
structural fiber in plant cell walls?
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
The conducting zone, or portion of a neuron that sends chemical signals to other cells, is also called the ________
a. trigger zone b. dendrites c. cell body d. axon terminal
The most diverse of the mammals are the
a. rats. b. bats. c. dogs. d. cats. e. equines