Which of the following statements concerning enzymes is false?
A) They can carry out hundreds of chemical transformations per second.
B) Many activities in living organisms require multiple enzymes.
C) One enzyme will work on many different substrate molecules to produce many different products.
D) They accelerate the rate of chemical reactions.
Answer: C
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Which protozoan parasite can invade the intestinal wall using a protease enzyme that not only breaks down the wall tissue but also cleave IgA, IgG, and complement components?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica
Populations of all organisms change from one generation to the next because their DNA changes over
time. This is known as:
a. artificial selection. b. biological evolution. c. natural selection. d. artificial selection and natural selection only e. developmental selection.
The presence of which hormone in a mother's urine indicates that she is pregnant?
a. luteinizing hormone b. follicle-stimulating hormone c. human chorionic gonadotropin d. progesterone e. estrogen
Describe the four requirements for chemical evolution and why each was essential. What will be an ideal response?