The most common autosomal abnormality seen among humans is
A) Edwards syndrome.
B) XXY.
C) Patau syndrome.
D) a deletion in chromosome 5.
E) trisomy 21.
Ans: E) trisomy 21.
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Some major changes that occurred in horse body size, foot anatomy and tooth morphology are hypothesized to be due to natural selection because of ...
A. changes in global climates which resulted in changing environments from forest to grasslands. B. changes in global climates which resulted in changing environments from grasslands to forests. C. changing climates from dry to wet. D. changing climates from wet to dry. E. increase in reproduction of larger animals due to lack of water in the dry environment.
What is the best definition of an organ?
a. a single type of tissue b. a type of glandular tissue c. two or more tissues working together to perform a specific task d. muscle tissue that has differentiated from stem cells e. a collection of cells and interstitial fluid
Briefly explain the differences between cellular respiration and fermentation. How do these processes differ in terms of energy output for the cell?
What will be an ideal response?
Action potentials travel down nonmyelinated axons at ________ action potentials travel down myelinated axons.
A. variable speeds, sometimes faster and sometimes slower than B. slower speeds than C. faster speeds than D. the same speed