Which of the following statements is incorrect?
A) Enzymes raise the activation energy of a reaction.
B) Enzymes speed up the rate of a reaction.
C) Substrates bind to an enzyme's active site.
D) Enzymes change shape when they bind to a substrate.
Ans: A) Enzymes raise the activation energy of a reaction.
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Answer the following statements true (T) or false (F)
1. Phylogenetic analyses of some vertebrate mineralcorticoid and glucocorticoid receptors and their ligands has suggested that the hormones evolved prior to their receptors. 2. Vasotocin is present in non-mammalian vertebrates and shares structural and functional properties with mammalian antidiuretic hormone and oxytocin. Through these similarities it has been suggested that vasotocin could be the ancestral precursor to the posterior pituitary hormone in vertebrates. 3. Vitamin D is a hormone produced in part by exposure to sunlight. 4.
A researcher is investigating the morphology of complete flowers. Which of the following organs must his flowers contain?
A. calyx, corolla, receptacle, and carpels B. calyx, corolla, carpels, and ovules C. calyx, corolla, stamens, and anthers D. calyx, corolla, carpels, and pistils E. calyx, corolla, androecium, and gynoecium
A tiny loop of double-stranded DNA describes a
a. bacterium. b. DNA ligase. c. plasmid. d. antibiotic.
Black and brown guinea pigs are bred together. Assuming their color is determined by one gene, and that there is a dominant and a recessive allele, how would you determine which allele is dominant? How could you determine the genotypes of the parents? Explain.
What will be an ideal response?