A golfer wants a new set of clubs to improve her game. In an experiment, she goes to the driving range and compares the distance she hits a bucket of golf balls with drivers of different materials in the head before making her purchase decision. In this simple experiment, the standardized variable is the
A. wind direction when the experiment took place.
B. type of material used to make the golf ball.
C. all of these except the type of material used to make the club.
D. angle the ball was hit by the head surface of the club.
E. force generated by her swing, when hitting the ball.
D. angle the ball was hit by the head surface of the club.
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Modify the following statement to make it correct: Ribozymes are ribonucleosomes used by bacteria and eukaryotic cells to modify DNA.
A. Ribozymes are ribonucleases used by bacteria and eukaryotic cells to modify DNA. B. Ribozymes are ribonucleosomes used by bacteria and eukaryotic cells to modify RNA. C. Ribozymes are ribonucleases used by bacteria and eukaryotic cells to modify RNA. D. Ribozymes are ribonucleosomes used only by eukaryotic cells to modify RNA.
The two-stage thymic selection process for selecting self-tolerant, antigen-reactive T cells results in
A) allelic exclusion. B) clonal deletion. C) complementarity-determining regions. D) somatic hypermutation.
An atom has 20 electrons and 20 neutrons. What is the mass of this atom?
A. 10 B. 20 C. 40 D. 80
Work by ________ laid the foundations of immunology with the development of vaccines
A) Redi and Spallanzani B) Koch and Pasteur C) Jenner and Pasteur D) Lister and Semmelweis E) Pauling and Woese