The modern, living plants in which pollen-producing organs and egg-producing organs are situated
very close together are the
a. gymnosperms.
b. angiosperms.
c. bryophytes.
d. seedless vascular plants.
e. seed plants.
B
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Which of the following structures is NOT found in
mature sperm? a. nucleus b. acrosome with enzymes c. mitochondria d. microtubules in the tail e. ribosomes
The particular type of element is determined by the number of:
a. electrons b. protons c. neutrons d. valence electrons e. energy levels
Regarding the experiments that "proved" spontaneous generation, which of the following statements is probably true?
a. Air was lacking. b. Too much heat was applied. c. The food source could not support life. d. Microorganisms were already present. e. Excess carbon dioxide was present.
The following diagram is a cell from a species that has a diploid number of 4. What stage of meiosis or mitosis does this diagram appear to be showing?
a) anaphase of mitosis b) anaphase I of meiosis I c) anaphase II of meiosis II d) metaphase II of meiosis II