Describe how the structure of the bacterial cytoplasmic membrane relates to its function of selective permeability
What will be an ideal response?
The structure and function of the cytoplasmic membrane are explained in the fluid mosaic model. The cytoplasmic membranes of bacterial cells are composed of phospholipids, which create a semipermeable barrier to the cell's outer environment. The only molecules that can easily cross the membrane are small, lipid soluble molecules. Other types of molecules must use the wide variety of transport proteins embedded in the phospholipid bilayer to cross the membrane. In this way, the cell can control the concentration of both its nutrients and its waste products. The cytoplasmic membrane can also be used for energy production and for photosynthesis in prokaryotic cells.
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The placenta, which sustains the developing embryo and fetus, originates only from maternal tissue.
Answer the following statement true (T) or false (F)
Vascular plants and air-breathing animals first appeared during which time period?
a. Silurian period b. Permian period c. Cambrian period d. Ordovician period e. Cretaceous period
The genes incorporated into the genome of Golden Rice include (select all that apply)A) daffodil phytoene synthase geneB) bacterial carotene desaturase geneC) bacterial beta-galactosidaseD) daffodil lycopene beta-cyclase gene
What will be an ideal response?
Why is trisomy 21 seen so often, but other trisomies (such as trisomy 1) are relatively rare?
A) Other trisomies are just as common as trisomy 21, but individuals are healthy and therefore go undetected. B) Trisomy 21 occurs more frequently than other trisomies because chromosome 21 is very small and more prone to nondisjunction. C) Trisomy 21 occurs more frequently than other trisomies because chromosome 21 determines the sex of the fetus. D) Other trisomies are most often lethal; the fetuses are spontaneously aborted. E) Other trisomies are more likely to be detected by karyotyping and prevented.