Which extraembryonic membrane forms finger-like projections of the placenta?
a. yolk sac
b. amnion
c. chorion
d. allantois
e. umbilical cord
ANSWER: c
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Skeletal muscles are made up of bundles of elongated, cylindrical cells called ____
a. muscle fibers b. sarcomeres c. tendons d. ligaments e. myofibrils
Type I survivorship curves ____
a. are characteristics of mice and other rodents b. typify a population in which all ages have an equal chance of survival c. indicate a high mortality rate in the very young d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age e. are typical of annual plants
During which substage of mitosis do sister chromatids break apart and start moving to opposite poles of the cell?
A. Metaphase B. Prophase C. Telophase D. Anaphase
Cnidarians typically obtain food by:
A) forming cooperative arrangements with photosynthetic organisms. B) amoeboid-like engulfing of prey. C) stinging and pulling prey to the mouth with tentacles. D) filter feeding.