What is the primary function of the leaf structure labeled as 5 in the accompanying figure?
a. food storage
b. gas exchange
c. photosynthesis
d. nutrient absorption
e. water transportation
ANSWER: b
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A paralog ____________
A. is found for every gene in mammals B. is only found on the X but not the Y chromosome C. can explain the lack of phenotype for a gene knockout D. cannot be mutated E. has the same DNA sequence as the original duplicated gene
The enzyme that adds nucleotide bases to each growing daughter strand in the replication process is called:
a. replication enzymes. b. DNA polymerase. c. insertion sequence enzymes. d. transcriptase.
Details of small internal cell structures are best visualized with a
A. Transmission electron microscope B. Bright-field microscope C. Dark-field microscope D. Scanning electron microscope E. Fluorescent Microscope
A negative feedback system has four steps. Please choose the answer that lists the steps in the correct order.
A. Sensory receptors, stimulus, brain, effectors B. Stimulus, sensory receptors, brain, effectors C. Effectors, brain, sensory receptors, stimulus D. Brain, effectors, sensory receptors, stimulus E. Stimulus, effectors, sensory effectors, brain