Below is the structure of leucine, an amino acid. What type of bond is the arrow pointing to?
A) a nonpolar covalent bond
B) a polar covalent bond
C) an ionic bond
D) a hydrogen bond
Answer: B
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Describe the packing of chromatin from the 10-nm to the 30-nm fiber stage. What is the role of histones?
What will be an ideal response?
Thick protein filaments in muscle contain
A. actin. B. malleus. C. axon. D. myosin.
The probability of producing a child who suffers from cystic fibrosis by two parents who are carriers
for the autosomal recessive disorder is a. 50 percent. b. 0 percent. c. 100 percent. d. 25 percent. e. 75 percent.
Which one of the following is TRUE regarding knowledge gained through scientific investigation?
A) The knowledge can be used to prove or disprove religious beliefs. B) Scientific knowledge cannot be used to improve human life through technology. C) The information can be used to detect problems at an early stage and correct mistakes. D) Society as a whole generally ignores scientific information. E) The knowledge has resulted in less-efficient sources of energy yet better health care.