Which of the following best describes fertilization in the moss life cycle?
a. Pollen is blown by the wind to a female cone, where it forms a pollen tube that grows
toward where the egg will form.
b. Flagellated sperm swim in a film of water on the surface of the plant to reach an egg.
c. Flagellated sperm are blown by the wind to a location near an egg, and then swim through
plant fluids to reach the egg.
d. Flagellated sperm swim through plant fluids to reach an egg.
e. Flagellated sperm attach to the moist skin of certain animals and are transferred to the
surface of the plant to reach an egg.
B
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Which of the following mechanisms is used by retrotransposons?
A. cut-and-paste transposition B. replicative transposition C. bacterial transduction D. transposition via an mRNA intermediate E. lysogeny
The initial circumstance that led some to believe that Abraham Lincoln had Marfan syndrome was that ____ had the
disease. a. one of Lincoln’s descendants b. Lincoln’s sister c. a descendent of Lincoln’s great-great-grandfather d. DNA analysis on Lincoln’s skull determined that he e. Photographs of Lincoln provided physical evidence that he
Some fish have bony fins. If the body of water they are in dries out, these fins can be used to help the fish "walk" to another body of water. In this context, bony fins are an example of ________
A) an exaptation B) an adaptation C) a macroevolutionary event D) paedomorphosis
Please choose the answer that best fills in the blanks of this sentence in the correct order. A molecular fragment of an antigen that serves as the primary signal that the molecule is foreign is called a(n) ______, whereas a small foreign molecule that can only elicit an immune response when linked to another larger molecule is called a(n) ________.
A) Allergen; hapten B) Epitope; immunoglobulin C) Epitope; hapten D) Hapten; epitope