When light is absorbed by rhodopsin, ____
a. discs from the outer segment of the rods and cones begin to grow
b. discs from the outer segment begin to shed
c. cis-retinal is converted to trans-retinal
d. trans-retinal is converted to cis-retinal
e. the inner segment of the rods and cones releases neurotransmitters
ANSWER: c
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Which of the following statements is correct regarding chromosomes?
A) Chromosomes are strands of DNA, tightly wrapped up, that are located everywhere in the cell. B) Chromosomes are strands of RNA, tightly wrapped up, that are in the cytoplasm. C) Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus. D) Chromosomes are strands of RNA, loosely wrapped up, that are located everywhere in the cell.
In a neutral solution the concentration of _____.
A) hydrogen ions is equal to the concentration of hydroxide ions b) hydrogen ions is less than the concentration of hydroxide ions c) water molecules is less than the concentration of hydrogen ions d) water molecules is less than the concentration of hydroxide ions e) hydrogen ions is greater than the concentration of hydroxide ions
A cell that has neither a net gain of water nor a net loss of water when it is immersed in a solution must be
A) isotonic to its environment. B) hypertonic to its environment. C) hypotonic to its environment.
Why does a protein not function after it has been denatured?
A. The R groups form additional bonds causing the structure to become more compact. B. The normal peptide bonds are ruptured and the individual amino acids are not held together any more. C. The normal bonding between the beta sheets has been disturbed and the protein loses its normal shape. D. The normal bonding between the hydrogens in the alpha helix has been disturbed and the protein loses its normal shape. E. The normal bonding between the R groups has been disturbed and the protein loses its normal shape.