Cephalization is
a. the division of the trunk into a scolex, neck, and body.
b. the presence of a head with sense organs.
c. sexual reproduction involving self-fertilization.
d. the ability to replace lost body parts.
a
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Which of the following is true about gametogenesis in humans?
a. Gametogenesis begins at puberty for males and females. b. Oogenesis starts during fetal development, while spermatogenesis begins at puberty. c. Spermatogenesis starts during fetal development, while oogenesis begins at puberty. d. In both males and females, gametogenesis results in four gametes from each diploid germ cell.
A deficiency of vitamin D causes
a. scurvy. b. rickets. c. kidney stones. d. a goiter. e. dwarfism.
Eukaryotes require more complex methods of gene regulation than prokaryotes because:a
eukaryotes have more operons than prokaryotes. b. transcriptional regulation is the only form of gene regulation in eukaryotes. c. all eukaryotic genes are constitutive. d. eukaryotes have more genes. e. individual genes must be regulated differentially in each cell type.
Which if the following is not a source of genetic variation in meiosis?
A) law of independent assortment B) tetrad formation C) crossing over D) the random lining up of chromosomes on the metaphase plate E) polar body formation