Each of the following are true of enzymes except
A. they may or may not require cofactors.
B. they increase the activation energy of a reaction.
C. they can be used over and over.
D. their active site is specific to the substrate.
E. All of the choices are true of enzymes.
Answer: B
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The ploidy of cells characteristic of an aneuploid is best represented by which of the following?
A) 2n + 1 B) n C) 2n D) 4n E) both choices B and C
Antigen presenting cells
A. include macrophages. B. engulf and modify antigen to be more immunogenic. C. include dendritic cells. D. hold and present processed antigen on their cell membrane surface. E. All of the choices are correct.
What is the basis of Mendel's laws?
A) the behavior of chromosomes during prophase I of meiosis only B) the behavior of chromosomes during mitotic anaphase C) the behavior of chromosomes during prophase I and prophase II of meiosis D) the behavior of chromosomes during metaphase I and anaphase I of meiosis
A scientist who studies the role of microorganisms in the environment is a(n) .
a. genetic technologist b. earth microbiologist c. epidemiologist d. environmental microbiologist