A protein's ________ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.
A. tertiary
B. quaternary
C. primary
D. both secondary and quaternary
E. secondary
Answer: E
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The master gene Hox helps to sculpt the body
plan of embryos by a. inhibiting the Dlx gene to prevent extra limbs. b. timing the activation of Dlx genes. c. causing cell death in any cell not expressing the Hox gene. d. converting sugar into energy to allow the process to go to completion. e. inducing mutations in plants.
Select all of the following statements that describe the structure of a molecule of DNA.A) twisted double helixB) single-strandedC) contains the nitrogenous bases, adenine, thymine, cytosine, and guanineD) contains deoxyribose sugarE) contains the nitrogenous bases adenine, uracil, cytosine, and guanine
What will be an ideal response?
In general, plant dermal tissues are found
A) at the outer surface of a plant. B) near the center of the plant stems and roots. C) lining the vascular tissue. D) throughout the plant body.
Which of the following viruses is considered a childhood disease, was first identified by a German physician, and is known to cause "three-day measles"?
A) rubella B) roseola C) echovirus D) coxsackie A virus E) rhinovirus