Which of the following is used to help protect the lungs from infection?
A. The mucociliary escalator moves trapped organisms away from the lungs by ciliary action.
B. Coughing and sneezing forcefully expel organisms away from the lungs.
C. Turbulent airflow deposits airborne pathogens on sticky mucosal surfaces.
D. All of the choices are correct.
Answer: D
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Which of the following statements is NOT a
possibility even though the phylogenetic lineages for hominids are not definitive? a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Homo and Australopithecus may have evolved at the same time.
You discover a new allele of a gene important for tail formation in mice. WT mice have long tails, but mice heterozygous for the allele have short tails
When you cross two heterozygous mice together, you obtain a 2:1 ratio of short-tailed mice to long-tailed mice. None of the short-tailed progeny are homozygous. What type of allele results in short tails? A) dominant negative allele B) temperature-sensitive allele C) lethal allele D) partially dominant allele E) incompletely penetrant allele
Which one of the following statements about energy is correct?
A. Chemical energy is a form of kinetic energy. B. A leaf falling from a tree represents potential energy. C. We convert about 99% of our food energy to useful work. D. Energy cannot be created or destroyed.
Human herpesvirus (1/2/3/4) is usually associated with lesions on the genitalia.
Fill in the blank(s) with the appropriate word(s).