The nucleus separates the chromosomes from the rest of the cell. How is the information in the DNA communicated to the cell?
What will be an ideal response?
The nuclear membrane has pores and is permeable to certain molecules. This allows selected materials, like RNA and proteins, to move in and out of the nucleus.
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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
Flatworms and mussels have cellular and extracellular fluids with osmolarity lower than that of the
external environment
Indicate whether the statement is true or false.Buttress roots help trees obtain oxygen from flooded soil
____________________ Indicate whether the statement is true or false.
Antipodals and synergids are
A. what will fuse to form the endosperm. B. nonfunctional vestigal structures. C. responsible for pollen tube formation. D. the result of double fertilization. E. produced in the female gametophyte.