Double fertilization refers to
(a) fusion of two sperm nuclei and two egg cells.
(b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus.
(c) maturation of the ovary into a fruit.
(d) none of the above.
(b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus.
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The relative impermeability of membranes to water soluble molecules is a result of the ____
a. nonpolar nature of water b. presence of large proteins that extend through both sides of membranes c. presence of inorganic salt crystals scattered through some membranes d. presence of cellulose and waxes e. presence of phospholipids in the lipid bilayer
The goal of eugenics is to ____
a. select the most desirable human characteristics b. eliminate genetic disorders that reach a certain threshold in terms of their costs to individuals and society c. produce genetically identical humans. d. eliminate genes for abnormal behavior. e. produce genetically perfect people.
During a secondary immune response
a) antibodies are made quickly and in great amounts b) antibody production lasts longer tan in a primary response c) B cells become plasma cells d) all of the choices are correct
What is the function of RNA polymerase?
A. It proceeds slowly along the DNA strand, requiring about a minute to add two nucleotides to the growing mRNA molecule. B. It unwinds the double helix and adds nucleotides to a growing strand of RNA. C. It adds nucleotides to the 5' end of the growing mRNA molecule. D.It relies on other enzymes to unwind the double helix. E. All of the above.