The portion of the cytoskeleton that attaches, pulls, and guides the chromosomes during cell division is the
A. kinetochore.
B. Golgi body.
C. mitotic spindle.
D. centrosome.
E. centromere.
C. mitotic spindle.
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Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
Kendra has a kidney disease that is caused by a genetic mutation that leads to the
malfunctioning of her kidneys. Would this be considered a disease or a mutation?
a. It is a disease because it is associated with specific physical symptoms. b. It is an infection because it involves her genes. c. It could be either an infection or a disease. d. It is an infection because she has obvious physical symptoms
Sexually transmitted bacteria cause _____
a. trichomoniasis c. syphilis b. genital herpes d. all of these
Which of the following was not an adaptation for animals to live on land?
a. internal fertilization b. egg shell c. embryo development within the female d. external respiratory surfaces e. skeletal system and muscles