Evidence of crossing over can often be seen under the light microscope as a structure called a _______.
A. kinetochore
B. centromere
C. chiasma
D. centriole
C. chiasma
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Fraternal twins arise from two different fertilized eggs and are called ____ twins
Fill in the blank with the appropriate word.
Which of the following statements comparing hemidesmosomes with desmosomes is TRUE?
A. Hemidesmosomes are anchorage junctions but desmosomes are not. B. Hemidesmosomes interact with actin filaments while desmosomes interact with intermediate filaments. C. Both hemidesmosomes and desmosomes associate with integrin, but not cadherin molecules. D. Hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells. E. Hemidesmosomes are found in plant cells while desmosomes are found in animal cells.
Functionally, what is the muscle fiber's fundamental unit of contraction?
A) thick filament B) thin filament C) myofibril D) sarcomere
Subunit vaccines are safer than traditional vaccines because they
A) are acellular. B) are administered in food. C) do not pose a risk for causing the disease. D) are acellular and do not pose a risk for causing the disease. E) are acellular and can be administered in food.