All of the following characteristics are shared between plant and animal development except that in animals, but not plants, _____
A) gene expression in developing embryonic tissues is closely regulated
B) orientation of cells and tissues is critical for proper development
C) differentiation of cells is directed and maintained by cascades of molecular signals
D) once animal cells are differentiated, they cannot de-differentiate and redifferentiate
Answer: D
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There are five antibody classes: __________,
__________, __________, __________, and __________. (Ig stands for __________.) Fill in the blank(s) with the appropriate word(s).
The diversity of haploid daughter cells is increased by the independent assortment of chromosomes at anaphase and by
a. crossing over and recombination. b. somatic mutation. c. chromosome elimination. d. the selection of the fittest sperm.
The upper atmospheric region rich in ozone (O3) that screens out incoming ultraviolet (UV) radiation is called
A. proterozoic region. B. stratosphere. C. ozone layer. D. troposphere. E. radiosphere.
Heterotrophic eukaryotes that digest their food externally and absorb the small molecules are referred to as
A) bacteria. B) fungi. C) plants. D) multicellular algae.