Which of these does not occur in a cell during the mitotic cell cycle?
A) Chromosomes line up in single file.
B) Sister chromatids pair up and join at the centromere.
C) Two daughter nuclei are formed.
D) Cytoplasm is divided.
E) Centromeres separate.
B) Sister chromatids pair up and join at the centromere.
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A public health official was asked to speak about immunizations during a civic group luncheon. One parent asked if rubella was still a problem. In answering the question, the official cautioned women planning to have another child to have their present
to have another child to have their present children immunized against rubella. Why did the official make this statement to the group? A. Rubella is spread very easily by respiratory secretions and is largely asymptomatic. However, it can cause birth defects/stillbirth in pregnant women. Women with other children would want to prevent these children from acquiring the virus before attempting to conceive a new child in order to protect the fetus. B. Rubella is passed very easily between children, so the official was trying to protect the child that would soon be born from this infection that might be brought in by its siblings after it was born. C. The official is getting kickbacks and bribes from the companies making the vaccines, and he's trying to pad his pockets by getting as many people immunized as possible, regardless of whether they need it or not. D. Rubella infections often lead to very serious and potentially fatal complications. While a woman is pregnant, she may not be able to take care of a sick child as easily. The vaccine will prevent the child already in the family from falling ill and potentially dying due to these possible complications.
Intervertebral discs are made of
a. fibrocartilage. b. bone. c. fat. d. tendon. e. muscle.
Which of the following is smallest in diameter?
A) Capillary B) Veni C) Artery D) Venule E) Arteriole
Blood returning to the left atrium of a frog heart has just come from ________.
A. the brain or the skin B. the skin only C. the lungs or the skin D. the lungs or the brain E. the brain only F. the lungs only