Which of the following sentences is an accurate description of bacteriophage?
A) Bacteriophage are bacteria that infect viruses, eventually lysing them.
B) Bacteriophage are viruses that infect bacteria, eventually lysing them.
B) Bacteriophage are viruses that infect bacteria, eventually lysing them.
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Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.
BRCA1 and BRCA2
a. are called cancer genes. b. code for tumor suppressing proteins. c. are involved in DNA repair mechanisms. d. in their mutated forms often occur in cancerous breast cells. e. are all of these.
In a reflex arc, the correct sequence of cell types through which an electrical signal would pass would be
A. motor neuron ? sensory neuron ? interneuron in the PNS B. sensory neuron ? motor neuron ? interneuron in the CNS C. sensory neuron ? interneuron in the CNS ? motor neuron D. motor neuron ? interneuron in the PNS ? sensory neuron
Fungi called Deuteromycetes are not known to reproduce sexually. Nonetheless, most of them are considered members of the ________ on the basis of genetic sequences
A) Zygomycota B) Basidiomycota C) Ascomycota D) Sporozoa E) Rhizaria