Tight junctions ____
a. seal the spaces between cells
b. allow ions and small molecules to pass between cells
c. allow cells to communicate with each other
d. give the cell its shape
e. anchor the cell membrane to the cell wall
A
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What is the main difference in the formation of coal vs. the formation of natural gas and oil?
A. Coal formed mainly from deposits of plants and animals living in oceans and natural gas and oil formed mainly from the remains of plants and animals in swampy anoxic environments. B. Coal takes several million years to form and natural gas and oil take much less time, roughly several thousand years. C. Natural gas and oil require intense heat and pressure to form and coal only requires an anoxic environment. D. Natural gas and oil formed mainly from deposits of plants and animals living in oceans and coal formed mainly from the remains of plants and animals in swampy anoxic environments.
Analogous structures serve the same function, are similarly constructed, and are inherited from a common ancestor.
Answer the following statement true (T) or false (F)
A "structuralist" biologist would explain an organism's features as the result of ________
A) natural selection acting on random, small-scale variation B) the inheritance of traits acquired over an individual's lifetime C) principles of mathematics and physics that determine form and function D) major "leaps" or "jumps" in phenotype within one generation E) divine intervention in an organism's DNA
A nonsense mutation:
A: results in a protein that is truncated from the N-terminal end. B: would likely not affect the activity of a protein. C: would not affect the primary structure of a protein. D: must result from a shorter mRNA transcript of the gene. E: is a result of a change in a codon for an amino acid in a protein to a stop codon.