The oldest proposed cell microfossils come from structures called _____.
A. stromatolites
B. crystal filaments
C. hydrothermal vents
D. pyrite
E. tectonic plates
Answer: A
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The mode of transmission of A. denitrificans can best be described as:
a. person-to-person contact. b. exposure to contaminated water. c. contaminated fluids or medical solutions. d. close contact with animals.
Clays often have positively-charged surfaces. How may this have been important in the formation of organic macromolecules?
A. They are a source of ATP to run chemical reactions. B. They form covalent bonds with organic building blocks. C. They can form templates by binding organic building blocks. D. They are a source of oxygen to break down organic building blocks. E. They are formed from meteorites that carried organic molecules to Earth.
As an animal matures, it forms attachments to other individuals and develops preferences. This process is called
A. habituation. B. instinct. C. imprinting. D. associational learning. E. sensitization.
In a population that meets the Hardy-Weinberg equilibrium assumptions, 81% of the individuals are homozygous for a recessive allele. What percentage of the individuals would be expected to be heterozygous for this locus in the next generation?
A) 19% B) 18% C) 72% D) 81%