All of the following are characteristics of life EXCEPT
A. evolution.
B. reproduction.
C. homeostasis.
D. multicellularity.
Ans: D. multicellularity.
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Defects in bone marrow stem cells result in a condition known as
A. SCID. B. AIDS. C. Di George's syndrome. D. Chediak-Higashi disease.
The gray crescent in frogs
a. stimulates zygote formation. b. stimulates zygote development. c. establishes the frog’s head-to-tail axis. d. is not related to gastrulation. e. triggers tissue specialization.
Which of these would be considered a cis-regulatory element for a gene?
A. Methylation of DNA preventing transcription B. A region of DNA sequence upstream of a gene where transcription factors bind C. A DNA binding protein that functions to repress transcription D. A protein that binds to an enhancer to activate gene expression E. a ribosome that translates a mRNA sequence to produce a transcription factor
Which is incorrect about hepatitis A infection?
A. HAVRIX is an inactivated vaccine for prevention. B. It has flu-like symptoms with discomfort near the liver and darkened urine. C. It predisposes a person for liver cancer. D. Iimmune globulin therapy helps decrease the severity. E. It is transmitted by the oral-fecal route.