During appositional growth of cartilage, the cells that produce the matrix are the
A. fibroblasts.
B. osteocytes.
C. chondrocytes.
D. chondroblasts.
E. osteoblasts.
Answer: D
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Drugs that lead to birth defects in the formation of the limbs are most damaging when the conceptus is exposed to them during weeks
A. 1-2 of development, before the placenta is fully formed. B. 4-8 of development, when limbs are undergoing peak development. C. 12-16 of development, when limbs have formed but are not fully mature. D. 24-28 of development, when plasticity of surrounding tissues has been lost.
Some ________ neurons are specialized to detect stimuli, whereas ________ neurons send signals to the effectors of the nervous system
A) afferent; efferent B) efferent; afferent C) afferent; association D) motor; sensory E) efferent; association
The tyrosine-kinase pathway is activated in response to certain lipophilic hormones, whereas the second messenger pathway is activated in response to certain hydrophilic hormones
Indicate whether the statement is true or false
The diploid number of chromosomes in a human is 46. Therefore, the number of chromosomes in a primary spermatocyte or primary oocyte is ________.
A) 23 B) 46 C) 92 D) 38