Campos, llano, and cerrado are all areas of
A) tropical rain forest.
B) tropical savanna.
C) mediterranean shrubland.
D) desert.
B
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A large lateral spine is characteristic of which Schistosoma egg?
a. Schistosoma mansoni b. Schistosoma japonicum c. S. haematobium d. Schistosoma mekongi
How does jasmonic acid contribute to the activation of the wound response in tomato plants?
A. It moves through the phloem of the plant until it reaches the wound site. B. It produces a polypeptide that binds with membrane lipids. C. It binds to enzymes in the gut of the predator. D. It increases the energy available for the plants to fight the predator. E. It signals gene expression, leading to the production of a proteinase inhibitor.
When a cell loses telomerase activity, what is the predicted effect?
A) Telomeres will increase slightly with each cell division. B) After 30–50 divisions, the cell will show signs of senescence and then die. C) An immune stem cell will increase white blood cell production. D) A normal somatic cell will gain the ability to divide indefinitely. E) The cell will die immediately.
In an experiment, DNA from the linear form of the bacteriophage Lambda was cut into fragments using the restriction enzyme Hind III. Restriction enzymes are isolated from bacteria and cut DNA in specific locations
Hind III cuts the Lambda DNA between the adenine nucleotides on the complimentary strands in a specific sequence, as indicated in the diagram, producing eight different size fragments. These fragments are then separated with an electrical current based on size after the DNA fragments are placed in a porous gel, a process called gel electrophoresis. cut site ? 5' A A G C T T 3' 3' T T C G A A 5' ? cut site Select an observation that best describes a correct aspect of the two processes of restriction digest and gel electrophoresis: A) When separated on a gel, the pattern of DNA bands will be characteristic of those cut with Hind III, different restriction enzymes will not produce these same fragments. B) The sequence AAGCTT is found eight times in the Lambda genome and the restriction enzyme Hind III finds each location. C) If an electrical current is not used, eight separate DNA bands would be visible, but they would not be separated as much as when an electrical current is used. D) Only the restriction enzyme Hind III can be used to cut Lambda DNA since restriction enzymes are specific to the type of DNA they can cut.