Genetic material of a cell is inside the
a. cytoplasm
b. nucleus
c. organelle
Ans: b. nucleus
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Which one of the following is the structure of the eye that serves to focus light on the retina?
A. cornea B. lens C. sclera D. pupil
Choose the most influential contributing factor to the reduced sense of smell in humans compared with the other great apes.
A. number of olfactory receptor (OR) genes present in the genome B. aneuploidy C. pseudogenes D. conservation of synteny E. one more chromosome in humans compared to the other great apes
A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?
A. The culture medium must be differential. B. The microbiologist used too much inoculum. C. The culture is contaminated. D. The culture medium must be selective. E. The incubation temperature was incorrect.
HEPA filters are used to remove microbes from
A. liquids. B. air. C. medical instruments. D. human tissues. E. All of these choices are correct.