Which is an example of active immunity?
A. antibodies produced from a vaccine, or a person receiving an injection of antibodies
B. a fetus acquiring antibodies through the placenta, or a person receiving an injection of antibodies
C. a person receiving an injection of antibodies
D. a fetus acquiring antibodies through the placenta
E. antibodies produced from a vaccine
E. antibodies produced from a vaccine
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Which of the following statements is false?
A. After entering the uterus, sperm must pass through the cervix in order to enter the fallopian tubes. B. During ovulation the oocyte is expelled from the ovary and enters the fallopian tubes. C. The oocyte is the largest cell by volume in the human body. D. Some types of cervical mucus block the passage of sperm, whereas other types guide sperm. E. If an oocyte is not fertilized then it is removed from the body through menstruation.
The alteration of a cell’s hereditary type by the uptake of DNA released by the breakdown of another cell is called
____.
a. replicationb. transformation c. crossing-over d. excision repair e. ligation
What type of respiratory system is found in insects?
1.Countercurrent exchange 2.Internal gills 3.Lungs 4.Trachea
Which of the following organisms would you most likely expect to find preserved as a fossil?
a. a jellyfish b. a shelled arthropod such as a trilobite c. an earthworm d. a nematode e. a protozoan