Members of the genus Mycobacterium cause which of the following diseases in humans?
A. Tuberculosis and Leprosy
B. Meningitis
C. Diphtheria
D. Abscesses
Answer: A
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For each function described below, choose the cytoskeletal element it best characterizes (some of the functions listed are carried out by more than one cytoskeletal element): a. microtubules b. microfilaments c. intermediate filaments
________ provide structural support for epithelial cell shape (keratins) ________ enable movement of cells ________ enable movement of substances within cells ________ provide structural support for fibroblast cell shape (vimentins) ________ arrange and tether organelles within the cytoplasm ________ provide cellular movement as a component of cilia flagella ________ provide structural support for nuclear envelopes (lamins) ________ attach to the cytoplasmic surfaces of desmosomes ________ provide structural support to cells and layers of cells through attachment to adherens junctions ________ help cells to withstand compression when organized a spokelike array by the centrosome ________ separate chromosomes during cell division when organized in a spindle apparatus _______ provide a contractile ring to separate cells during cell division ________ support the plasma membrane and organize membrane proteins ________ shorten cell shapes during contraction What will be an ideal response?
Which processes lead to most genetic variation in sexually reproducing organisms?
Select all that apply. A. crossing over B. random fertilization C. independent orientation of chromosomes in meiosis D. cytokinesis
How was the mechanism of sympatric speciation among hemp nettles in nature verified experimentally?
a. By simply creating unique hybrids under laboratory conditions b. By producing hybrids that were 98% fertile under laboratory conditions c. By producing experimental hybrids that could reproduce successfully with both parent species d. By producing experimental hybrids that formed fertile offspring with the naturally occurring hybrid e. By creating hybrids that reproduced through the F4 generation before dying from hybrid inviability
Reinforcement is an evolutionary process that occurs in a hybrid zone in which parental species adapt to two different
communities, and the hybrids thrive in an area of transition between the parental communities. __________ Indicate whether the statement is true or false.