What purpose is served by dna ligase?

a. to break hydrogen bonds in the dna structure

b. to seal single stranded breaks in the dna double helices

c. to seal double stranded breaks in the dna single helices

d. all of these

e. none of these?

Blood type is controlled by two equally dominant genes. What type of example is this? A. codominanceB. incomplete dominanceC. sex-linked genes D. recessive dominance

A 2-year-old child is admitted to the pediatric unit with fever, seizures, and vomiting. he's awake and alert. as the nurse is putting a gown on the child, the nurse notices petechiae across the child's chest, abdomen, and back. the nurse should:

What responses it takes to open or close ion channels

Which of the following statements about the biosphere is NOT true? A The biosphere is a system closed to matter. B Energy enters the biosphere in the form of sunlight. C Nutrients in the biosphere must be continuously recycled.

The remains of organisms that once lived that provide information about evolution are?

The amino acid proline is one of the three amino acids that watson describes as having "special properties". what is special about proline?

Which nursing action is accurate when administering an im injection using the z track method?

Which of the following is not a symptom of influenza? a. headache b. muscular aches c. dry cough d. diarrhea

Which term describes this example? A child with no freckles has a mother who has freckles and is heterozygous and a father who has no freckles and is homozygous recessive. a. female b. heterozygous c. homozygous recessive d. homozygous dominant e.

At which of the following temperatures will the average energy of motion of the particles in a substance be greatest? A. - 12 C B. 0 C C. 12 C D. 20 C