Altering the three-dimensional structure of an enzyme might
A. change the amount of energy needed for a reaction.
B. prevent the substrate from binding the enzyme's active site.
C. change the type of substrate that binds the enzyme's active site.
D. change the type of product produced in the reaction.
E. allow the reaction to occur at a faster rate.
B. prevent the substrate from binding the enzyme's active site.
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A tissue sample containing fibroblasts surrounded by parallel bundles of collagen and elastin fibers is an example of
a. bone tissue b. dense connective tissue c. cartilage d. blood e. adipose tissue
In a tropical forest some leaves are dark green and some are light green. In a population of caterpillars, homozygous
dominant dark green caterpillars thrive eating the dark green foliage, while homozygous recessive light green caterpillars thrive eating light green foliage. However, heterozygous caterpillars of an intermediate color green are easily seen by birds and eaten, thus their numbers are far less than the dominants or recessives. This is an example of ____ selection.
a. directional b. stabilizing c. disruptive d. frequent e. mutational
The red blood cells of people with sickle cell anemia have abnormal shapes due to ____
a. hemoglobin molecules with mutant beta globin subunits sticking together and forming long fibers in the cytoplasm b. destruction of the hemoglobin molecules c. loss of hemoglobin through leaky cell membranes d. the attachment of phosphate groups to the hemoglobin molecules e. the binding of methyl groups to the heme group of the hemoglobin molecule causing desiccation of the cells
The spindle begins to form in
A. telophase I. B. prophase I. C. interphase. D. telophase II.