During DNA cloning, why is the DNA of interest inserted into the middle of the lacZ+ coding sequence in the plasmid
vector?
a. It makes the bacteria resistant to the antibiotic.
b. It allows researchers to distinguish bacteria that contain the plasmid from those that do not.
c. It aids scientists in developing new antibiotic treatments.
d. It allows researchers to distinguish bacteria that contain the recombinant plasmid from those that contain just
the vector.
e. It makes the bacteria produce more clones.
ANSWER: d
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Following the completion of meiosis in animals, males produce ____ sperm cell(s) and females produce ____ egg(s)
a. 4 diploid; one diploid b. 4 haploid; one haploid c. 2 diploid; 4 haploid d. 4 haploid; 2 diploid e. 4 haploid; 3 haploid
The chromosome theory of inheritance, developed by Sutton and Boveri, provided an explanation for Mendel’s
principle of segregation by proposing that:a. sister chromatids separate during mitosis. b. all genes are linked on a single chromosome. c. linked genes are inherited together. d. homologous chromosomes segregate during meiosis. e. homologous chromosomes segregate during mitosis
What is the CORRECT order for the application of Koch's postulates?
I. Inoculate suspect agent into test subject and observe that subject develops disease of interest. II. Isolate and culture suspect agent in the laboratory. III. Find suspect agent is every case of disease of interest but not in healthy hosts. IV. Recover and isolate suspect agent from test subject. A) III, I, IV, II B) IV, I, III, II C) I, II, III, IV D) III, II, I, IV E) IV, I, II, III
Which of the following hormones is mismatched with its producing gland?
A. pineal gland-melatonin B. ovaries-follicle-stimulating hormone C. thymus gland-thymosins D. ovaries-estrogen E. testes-androgens