Which of the following is true about the nucleus?
A. The nucleus is considered the control center of the cell.
B. The nucleus contains all the cell’s DNA.
C. All cells have a nucleus.
D. All of these?
Ans: A. The nucleus is considered the control center of the cell.
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Imagine that a woman is in the final week of her pregnancy. Her doctor gives her an injection of oxytocin. The likely result of this is that the pregnant woman would _____
A) undergo the loss of oxytocin receptors from her uterine smooth muscle cells B) stop secreting prostaglandins from the placenta C) undergo vigorous contractions of her uterine muscles D) increase the synthesis and secretion of progesterone E) be prevented from lactation
Which of the following actions is part of the immune response in the respiratory system?
A) Coughing and sneezing B) Mucociliary blanket C) Alveolar macrophages D) All of the above
Consider an organism whose karyotype shows it to have a total of 60 chromosomes. How many chromosomes would be contained in the sperm of this organism?
A. 90 B. 46 C. 23 D. 30 E. 60
An animal, such as an arthropod, that transmits a pathogen from one host to another is a
A. vector. B. fomite. C. source. D. carrier. E. reservoir.