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
a
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Which of the following describes a deciduous conifer?
a. It drops all its leaves at once in autumn. b. It is pollinated by both beetles and birds. c. It grows new pine cones every six months. d. It has flowers that go dormant in winter.
Plant cell walls grow faster in a neutral environment - that is, when the pH is close to 7
Indicate whether the statement is true or false.
Which is a monosaccharide?
a. glucose b. chitin c. amylose d. starch e. glycogen
Tetrazolium chloride is used by the seed industry to indicate
(a) if a seed is undergoing photosynthesis. (b) if seeds are undergoing aerobic respiration. (c) if seeds are alive. (d) both b and c.