Which of the following characteristics of a fossil suggests that the species belonged to the hominin group?
A) prominent brow ridges B) small canine teeth and thicker tooth enamel
C) a protruding lower face D) large canine teeth and thinner tooth enamel
Answer: B
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Interpret the results to the following experiment
Transcriptional activity of chemotactic genes showed a high expression level during the following conditions: repelling away from compound 1, moving towards compound 2, and remaining sessile when presented compounds 3 and 4. A) Activity during movement in any direction led to high measurements observed, and the sessile population responded equally to both a chemoattractant and a chemorepellant but remained in the same location for their net movement. B) Gene expression by itself cannot distinguish between cells responding to both an attractant and repellent, so this ambiguity makes transcriptomics unfavorable but nonetheless indicates activity. C) The activity observed during a sessile existence suggests the molecular probe was targeting a chemotactic gene that is also involved in other non-chemotactic functions due to the activity observed. D) Transcriptomics as a whole cannot be used for chemotaxis genes because they are not regulated at the transcriptional level (i.e., they are constitutive), which is why activity is observed on all three conditions.
Which mineral comes from dairy products and dark green vegetables?
a. Sodium b. Iodine c. Chloride d. Iron e. Calcium
Which of the following is NOT true of enzyme
behavior? a. Enzyme shape may change during catalysis. b. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze only a specific reaction. e. Enzyme activity is not affected by pH and temperature.
You are the supervisor of a new reference microbiology laboratory, which will receive clinical specimens for identification of bacterial pathogens. When choosing the types of media to order for culture and isolation procedures in your laboratory, what question(s) do you need to answer?
A. What are the growth factors required by the bacteria that you will be identifying? B. What kind of microbiota will the patient specimens contain? C. What type of bacteria will you be culturing? D. All statements are correct.