Before zygotic genes become active, the stages of animal development are directed by the ____
a. environment
b. cytoplasmic determinants of the egg
c. cytoplasmic determinants of the sperm
d. cytoplasmic determinants of the egg and the sperm
e. zygote nucleus
ANSWER: b
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A foramen magnum located at the rear (posterior) of the skull indicates that the animal ________
a. could vary its body position from upright to quadruped b. walked upright c. was a hominid d. walked on all four feet
The earliest cells most likely ____
a. were prokaryotic cells b. did not have a nucleus but had membrane-bound organelles c. used oxygen gas in order to thrive successfully d. used energy from the sun e. were multicellular
Features that contributed to success on land include a(n) __________ and __________ that minimize water loss. Fill in the blank(s) with the appropriate word(s)
Iodine is the decolorizer in the Gram stain.
Answer the following statement true (T) or false (F)