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which statement correctly describes an immune response that takes place in mammals?

during a cell-mediated immune response, cytotoxic t cells bind to antigens and kill them.
during a humoral immune response, t cells signal b cells to release antibodies.
during an adaptive immune response, natural killer cells engulf harmful bacteria.
during an innate immune response, antigens stimulate the production of b cells.

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

What is thought to have caused the mass extinction at the end of the cretaceous period?

Use the above pedigree for questions 1,2, and 3 1. what kind of genetic disorder is represented in the pedigree? a. recessive b. dominate refer to the pedigree in question 1. 2. is the mutated gene in this disorder located on a sex chromosome (x or y) or an autosome? a. sex chromosome b. autosome refer to the pedigree in question 1. 3. which generation has individuals that you are certain are heterozygous for the mutated gene? a. generation 1 b. generation 2 c. generation 3