A drug designed to inhibit the response of cells to testosterone would almost certainly result in which of the following?
A) lower cytoplasmic levels of cAMP
B) an increase in receptor tyrosine kinase activity
C) a decrease in transcriptional activity of certain genes
D) an increase in cytosolic calcium concentration
E) a decrease in G protein activity
Ans: C) a decrease in transcriptional activity of certain genes
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Which statement is true about the structure of DNA?
A) It is a polymer made up of a string of amino acids. B) Each different sequence folds into a different three-dimensional shape. C) The two strands of a DNA molecule are held together by base pairing. D) It contains nitrogenous bases known as A, C, G, and U.
You notice in the fall that the oak trees on campus change color at slightly different times, even though the environment is the same for all the trees. What is the most likely explanation?
A) Natural selection is causing some trees to change. B) There are different alleles of the gene responsible for color change. C) The weather changes the genes of the oak trees each year. D) All the trees have the same genes, but each tree makes different proteins from the genes.
Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
A) Photosynthesis involves only reductions, whereas respiration involves only oxidations. B) Photosynthesis involves only oxidations, whereas respiration involves only reductions. C) In photosynthesis, carbon dioxide is oxidized to form sugar, whereas in respiration, sugar is reduced to form carbon dioxide. D) In photosynthesis, carbon dioxide is reduced to form sugar, whereas in respiration, sugar is oxidized to form carbon dioxide.
Which molecule is composed of a chain of amino acids?
A) carbohydrate B) lipid C) protein D) nucleic acid