Which of the following statements about fertilization in humans is false?
A. The fast block to polyspermy involves
modifications to the structure of the zona
pellucida.
B. Sperm must pass through a layer of follicle
cells and the zona pellucida before binding to
the egg plasma membrane.
C. Chemical cues released from the egg
guide the movement of sperm.
D. Sperm are incapable of fertilizing an egg
before undergoing capacitation in the female
reproductive tract.
E. The oocyte completes meiosis II only after
the plasma membranes of the egg and sperm
fuse.
A
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The structure of DNA and RNA differs in that:
A. DNA is typically single-stranded, whereas RNA is double-stranded. B. DNA folds into complex three-dimensional structures necessary for its activity. C. DNA building blocks have four different nitrogenous bases, whereas RNA has a fifth base. D. DNA contains a pentose sugar that has an additional hydroxyl group, which is lacking in the sugar found in RNA. E. RNA folds into complex three-dimensional structures necessary for its activity.
Lisa has a rare genetic defect that causes acute sun-sensitivity. Her mother has the defect, but her father does not. All of Lisa's siblings, two brothers and a sister, are also affected. All four siblings are married, but none of their spouses has the mutant gene. Draw a pedigree for this family. Identify and explain the most likely mode of transmission for this disorder
What will be an ideal response?
Which of the following cushions and protects
internal organs yet moves independently of the body wall?
a. the coelom b. the mesoderm c. the protostome d. the gastrovascular cavity e. the endoderm
The enzymes that unzip the hydrogen bonds of a DNA molecule in preparation for replication are _____.
A) hydrogenases B) helicases C) DNA polymerases D) DNA ligases