What type of synovial joints are metacarpophalangeal joints?
A. Ball-and-socket
B. Condylar
C. Hinge
D. Pivot
E. Saddle
Answer: B
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John is a 26-year-old man who begins to notice a progressive enlargement of feet, hands, cranium, nose, and lower jaw bone. His doctor recommends irradiation of the pituitary gland. What is the most likely diagnosis? Why?
What will be an ideal response?
An allele that is ________ will be expressed only if it is present on both chromosomes of a homologous pair.
A) dominant B) recessive C) incomplete D) phenotypic E) autosomal
"Anabolic metabolism" refers to
A) biochemical reactions that release energy from nutrients. B) all processes required to maintain life. C) biochemical reactions that break down compounds. D) biochemical reactions that synthesize compounds.
A mutation affecting the cytoplasmic distribution among dividing daughter cells in female meiosis prevents the normal distribution between the secondary oocyte and the polar body. Instead, two identically sized daughter cells with the same amount of cytoplasm are produced after each division while polar bodies are still designated and disintegrated. Knowing the main function of the polar body, what effect might this mutation have?
A. Embryos developed from the mutated secondary oocyte will lack the X chromosome. B. Sperm will not be able to penetrate the egg. C. Oocytes with abnormal chromosome numbers will result and produce zygotes with further abnormal numbers. D. After fertilization, the zygote may not have enough organelles and nutrients to support further cell divisions.