________ is a method used to determine the chemical structure and measure the relative abundance of individual molecules in a sample based on their mass to charge ratio
Fill in the blank with correct word.
Answer: Mass spectrometry
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Which of the following is a reason for the occurrence of a lag phase in a bacterial growth curve?
A. The medium may be different from the previous growth medium so that the cells must synthesize new enzymes to use different nutrients. B. The cells may be old and depleted of ATP, essential cofactors, and ribosomes that must be synthesized before growth can begin. C. The organisms may have been injured and require time to recover. D. All of these are potential reasons.
Suspension filter feeding animals capture food particles that are:
A. floating in the water around them. B. laying on the surface of the sea floor. C. attached to rocks or other hard surfaces. D. buried within the sediments. E. All of the answer options are correct.
Bacterial cells that cannot readily pick up DNA molecules from their surroundings can be forced to do
so by ____.
a. artificial transformation b. double crossing over c. crossing over d. constriction e. infection
Four of the five subunits listed below are
components of a nucleotide. Select the exception. a. pentose sugar b. amino acid c. pyrimidine d. phosphate group e. purine