A mutation in RTK receptor that allows the receptor to bind the ligand and pair with a wild-type receptor but blocks signal transduction is classified as a ________ mutation,
whereas a mutation that activates RTK pairing signal transduction even in the absence of ligand is classified as a ________ mutation.
Fill in the blank with correct word.
Answer: dominant negative; constitutively active
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The tissue that regrows a leaf from its base is the
A. intercalary meristem. B. lateral meristem. C. vascular bundle. D. apical meristem. E. tracheid.
This procedure is a technique used to generate large quantities of DNA from minute amounts for analysis.
A. variable number tandem repeat reaction (VNTR) B. polymerase chain reaction (PCR) C. DNA fingerprinting D. polymerization reaction
Atmospheric nitrite, produced from the reaction of ________ and ________, combines with water to form acid rain containing nitric acid (HNO3)
a. NO / O2 b. NO / O3 c. NO2 / NO3 d. N2 / O2
Please match the virulence factor of Streptococcus pyogenes to its description.
Capsule A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots D) Projecting surface antigen that facilitates adherence and resists phagocytosis E) Chemical surface layer that prevents an immune response by the host F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues