Which cell structure physically moves the cell's chromosomes?

A) the mitotic spindle B) the cell wall
C) the plasma membrane D) the contractile ring


Answer: A

Biology & Microbiology

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Which of the following substances helps make cells of xylem rigid to avoid collapse?

A. cellulose B. lignin C. chitin D. spongin E. parenchyma

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This chordate has a four-chambered heart, no

bladder, the males typically have no penis, and no teeth. This animal is

a. a bird. b. a crocodile. c. a bat. d. a frog. e. a shark

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Which of the following areas has not been identified by Conservation International as in need of additional sanctuaries?

A. Madagascar B. Alaska C. Papua New Guinea D. Brazil's Atlantic rainforest E. Noneoftheabove

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Amy just gave birth by cesarean section to a beautiful baby girl. All through her pregnancy, her mammary glands enlarged to prepare for milk production

However, in the day or two following the birth of her baby, Amy cannot eject a drop of the milk that is so obviously present in her breasts. What hormone is probably missing? A) oxytocin B) estrogen C) prolactin D) progesterone

Biology & Microbiology