What is a muscle that encircles a tube and controls the movement of food through the digestive tract is called?
What will be an ideal response?
sphincter
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In plant leaves, what are the tiny pores that allow carbon dioxide to enter and oxygen to exit?
What will be an ideal response?
This occurs when insertions or deletions cause the ribosome to read the wrong sets of three nucleotides.
A. point mutation B. frameshift C. translocation D. transcription
Which of the following events is not associated with the development of the female gametophyte?
A. A single parenchyma cell will enlarge to become a megaspore mother cell. B. The female gametophyte will contain three antipodal cells. C. The nucleus of the megaspore divides mitotically to produce eight nuclei. D. The megaspore undergoes meiosis producing four haploid megaspores. E. All of these are associated with the development of the female gametophyte.
An emergency room physician has withdrawn blood from a vessel in your arm. The dark red color of the blood indicates that it was
A) on its way to the tissues of the arm. B) going away from the heart. C) coming from the lungs. D) taken from a vein. E) taken from an artery.