The notochord forms from which type of tissue?
a. ectoderm
b. endoderm
c. mesoderm
d. chorion
e. amnion
ANSWER: c
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Which of the following statements concerning enzymes is FALSE?
a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules.
When a blood vessel is damaged, platelets adhere to the damaged site and release chemicals, which attract additional platelets. Thus, platelet attraction is considered to be a ________ feedback mechanism
Fill in the blank(s) with correct word
Select all of the following that are true about cephalopods.
A. They are very intelligent and are capable of learning by observation. B. They have a closed circulatory system C. They lack a shell. D. They are exclusively herbivorous. E. They may be very large and can weigh over 1000 pounds.
Estrogen is involved in calcium metabolism as well as female reproductive functions. This is why post-menopause, women experience which of the following conditions as a result of decreased estrogen?
a. gall stones b. dementia c. osteoporosis d. arthritis