Transcription produces which of the following?
a. mRNA
b. rRNA
c. tRNA
d. mRNA and tRNA
e. mRNA and rRNA
f. mRNA, tRNA, and rRNA are all produced by transcription.
Answer: f. mRNA, tRNA, and rRNA are all produced by transcription.
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The Staphylococcus aureus bacteria shown in the image below form biofilms in medical equipment. Bacteria such as this use quorum sensing to delay the production of toxins until the colony has reached a specific size. What advantage does this have over producing toxins immediately?
a. The toxins produced by bacterial biofilms are polymer chains that cannot be synthesized within individual bacteria.
b. Bacteria require the additional time to develop immunity against the toxins they release, which are otherwise fatal.
c. Quorum sensing ensures that the colony can remain undetected until it is large enough to damage or destroy its host.
d. Biofilms are capable of rudimentary intelligence via neural networking behavior when sufficient bacteria are present.
A __________ plane divides the animal body into dorsal and ventral parts
a. median b. frontal c. sagittal d. cross e. transverse
Amino acid sequences of the heme protein ____________have been studied in order to determine common ancestry.
a. cytochrome a b. cytochrome c c. hemoglobin d. hemoglobin A1c
Which of the following is not a type of neuron?
A. motor B. sensory C. afferent D. interneuron E. neuroglia