Viruses ____________.
a) sit on the fence between life and nonlife.
b) use either DNA or RNA as their genetic material.
c) only infect sick people.
d) all of the above are correct.
e) only a and c
Ans: e) only a and c
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Which of the following would be characterized as a juxtacrine signal?
A) contact-dependent B) endocrine C) self-responding D) distal neighbors E) both choices B and D
Unsaturated fats are considered healthier than saturated fats in the human diet
Indicate whether the statement is true or false.
Which of the following ions is associated with auxin and used during signal transduction that causes a plant to bend towards a light source?
A. H+ B. Ca2+ C. Mg2+ D. Na+
According to Patrick Forterre's hypothesis, viruses are ultimately responsible for ________
A) introducing DNA into the ancestors of Bacteria, Archaea, and Eucarya B) fusing with a bacterium and giving rise to the eukaryote nucleus C) introducing information-processing genes into the ancestral chronocytes D) enabling Archaea to withstand extreme environmental conditions causing mass extinctions