________ is the enzyme that hydrolyzes ________ in dairy products into glucose and galactose. Absence of the enzyme may cause cramps and diarrhea in a condition called ________
Fill in the blank with correct word.
Answer: Lactase; lactose; lactose intolerance
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Which of the following are exceptions to the universal genetic code that is used by most organisms?
A. Phenylalanine B. Selenocysteine C. Stop D. Lysine E. Pyrrolysine
Biological membranes are held together mainly by ____
a. hydrogen bonds between lipid molecules b. hydration layers over lipid molecules c. exclusion of the nonpolar regions of lipids by water d. hydrogen bonds between water molecules e. surface tension at the interface between layers of water molecules
If the syringe contains live R strain Streptococcus
pneumoniae a. the mouse will die. b. live S strain will be detected in the mouse’s blood. c. the mouse will live. d. no live R strain will be detected in the mouse’s blood. e. the live R strain bacteria will develop pathogenicity.
Proteins consist of long strings of:
a. deoxyribonucleic acid. b. ribonucleic acid. c. mRNA. d. codons. e. amino acids.