Several lineages of extinct ____ were jawless fishes with bony plates and scales and three brain regions (forebrain,
midbrain, and hindbrain).
a. acanthodians
b. conodonts
c. osteolepiforms
d. placoderms
e. ostracoderms
ANSWER: e
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What can happen when a complement protein encounters an antibody-antigen complex marking a pathogen?
A) The protein can mark the pathogen for destruction by T cells. B) The protein can destroy the pathogen. C) The protein can coat the pathogen to inactivate it. D) The protein can remove the antibody for use elsewhere.
Which of the following statements about herpesviruses is false?
A) Herpesviruses reproduce inside the host cell's mitochondria. B) Herpesviruses acquire their envelopes from the host cell nuclear membrane. C) Herpesviruses may remain dormant for long periods of time while inside the host cell nucleus. D) Herpesviruses may cause cold sores or genital sores to appear during times of physical or emotional stress.
Crop rotation occurs where different types of plants are grown on the land each season. If you had no access to chemical fertilizers, which of the following would be best to include in your rotation cycle?
A) beans B) cotton C) corn D) tobacco
The archenteron develops into
A) the mesoderm. B) the blastocoel. C) the endoderm. D) the placenta. E) the lumen of the digestive tract.