Where do the preganglionic neurons of the sympathetic division originate?
A.midbrain, Pons, medulla
B. Hypothalamus
C. T1-L2
D. S2-S4
C. T1-L2
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Which of the following selections correctly lists the sequence of events that occur during intramembranous ossification?
a) Ossification center develops > Calcification > Formation of trabeculae > Development of new periosteum. b) Calcification > Ossification center develops > Formation of trabeculae > Development of new periosteum. c) Ossification center develops > Formation of trabeculae > Calcification > Development of new periosteum. d) Development of new periosteum > Ossification center develops > Calcification > Formation of trabeculae. e) Ossification center develops > Calcification > Development of new periosteum > Formation of trabeculae.
The phenomenal diversity of antibodies produced by an individual is possible because
a. B-cells contain more genes than other cells of the body. b. once the gene encoding an antibody is transcribed, the mRNA is sloppily translated, in effect introducing mutations (and therefore diversity) post-translationally. c. even though they have the same number of genes as other cells of the body, virtually all of their genome is dedicated to antibody genes. d. the gene fragments encoding antibodies are cut, reshuffled and spliced during a B-cell's development, enabling innumerable amino acid sequences to be generated. e. None of these.
During which phase of meiosis do the centromeres of double-stranded chromosomes divide, followed by the sister chromatids moving toward opposite poles of the cell, and now being called single-stranded chromosomes?
A. Telophase II B. Anaphase I C. Metaphase II D. Metaphase I E. Anaphase II
Two basic types of bone tissue are compact bone and smooth bone
Indicate whether the statement is true or false