Which of the following does not occur when you are very, very cold?
A. You get goose bumps.
B. The arrector pili muscles contract.
C. Shivering occurs.
D. Smooth muscle contracts inside the blood vessels supplying the skin.
E. More blood flows to the surface of the body.
Answer: E
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Invasive species are introduced by humans to new geographic locations and:
A) are successful in colonizing a novel area. B) spread because they encounter none of their natural predators. C) All of the choices are correct. D) can outcompete and displace native species for biotic and abiotic resources. E) are usually considered pests by ecologists.
Crystalized and studied the tobacco mosaic virus
What will be an ideal response?
During DNA replication in a typical human cell,
A) only one origin of replication exists for each chromosome. B) multiple origins of replication function consecutively. C) multiple origins of replication function simultaneously. D) the origins of replication are at the centromeres. E) the origins of replication are at the telomeres.
The organelle that contains chlorophyll a and carries out photosynthesis in plants is the
A. central vacuole. B. cell membrane. C. Golgi body. D. mitochondrium. E. chloroplast.