Which feature is a unique, derived trait present in all birds?
a. ability to fly
b. four-chambered heart
c. feathers
d. lack of a urinary bladder
e. migration
ANSWER: c
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Put the following steps of the HIV life cycle in order:1.Viral
RNAs and proteins assemble into new viral particles that bud from the cell. 2.DNA copy of the viral genome is integrated into the host genome. 3.Viral reverse transcriptase makes a DNA copy of the viral RNA genome. 4.Viral particle enters the cell. 5.The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.
a. 3,2,5,1,4 b. 2,3,4,5,1 c. 4,2,3,1,5 d. 2,4,3,5,1 e. 4,3,2,5,1
Clownfishes are involved in a symbiotic relationship with:
a. corals. b. anemones. c. pearlfishes. d. sea cucumbers. e. sea fans.
If a short-day plant has a critical night length of 15 hours, then which of the following 24-hour cycles will prevent flowering?
a) 4 hours light/20 hours dark b) 8 hours light/8 hours dark/light flash/8 hours dark c) 6 hours light/2 hours dark/light flash/16 hours dark d) 8 hours light/16 hours dark e) 2 hours light/20 hours dark/2 hours light
Smallpox is a disease in which
A. transmission occurs only by direct skin contact with skin crusts. B. fever, malaise, rash, possible toxemia and shock occurs. C. recurrent episodes are called shingles. D. virus becomes latent in ganglia of sensory neurons. E. All of the choices are correct.