The side toes of a horse, the pelvis of the whale, and the human appendix are all examples of structures that resemble structures of presumed ancestors, which are known as
A. analogous structures.
B. homologous structures.
C. acquired structures.
D. vestigial structures.
E. homeotic mutations.
Answer: D
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Potential energy:
a) is energy that changes into chemical energy only with very high temperatures b) transfers motion to matter. c) is contained in matter placed in certain positions or arrangements. d) contains less energy than kinetic energy. e) is kinetic energy that has not yet been turned to heat.
As a scientist working for an antibioterrorism task force, you are asked to evaluate some biological samples for the presence of Yersinia pestis, the organism that causes the plague. After confirming that the samples do contain Y. pestis, you instruct your team to begin sequencing the strain. Since the genome sequence of Y. pestis is already known, why would sequencing this strain be useful?
A. to create a vaccine for this particular strain B. to help determine the source of the strain, and learn whether it has been genetically engineered C. to establish the course of infection, and determine whether the strain is altered by causing infection D. to provide better data for the genome database
Vesicles are used for transport during which of the following?
a. endocytosis only b. exocytosis only c. phagocytosis only d. both endocytosis and exocytosis
____ is a breakdown in the walls of the alveoli which causes a reduction in gas exchange.
a) Bronchitis b) Asthma c) Emphysema d) tuberculosis