If you forgot to heat fix a smear before doing a Gram stain, which of the following might occur?
A. The smear may not adhere to the slide.
B. The stains would not adhere to the bacteria.
C. The decolorization step of the Gram stain would not work properly.
D. Gram-positive and Gram-negative bacteria would both stain purple.
Answer: A
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Phage-encoded enzymes are
A. all produced simultaneously. B. produced in a sequential manner. C. strictly host enzymes. D. used to customize the cell for viral production. E. produced in a sequential manner AND used to customize the cell for viral production.
During fermentation, the immediate fate of the electrons in NADH is that they:a
are transferred to the electron transport chain. b. are transferred to an organic molecule. c. are transferred to O2. d. are used to make CO2. e. are used to form H2O
An allele is dominant in a heterozygote when it is
A.) expressed and the other allele is not. B.) a very common allele in a population. C.) the stronger of the two alleles. D.) more desirable than the other allele.
Which of the following defines an ecosystem?
A. all the places on Earth where living organisms can be found B. aspects of the nonliving environment interacting together C. all of the living organisms in an area interacting together D. all living organisms and the nonliving environment interacting together E. a group of organisms of the same species interacting together