How did Watson and Crick determine base pairing?

A. They analyzed the work of Phoebus Levene.

B. They used Chargaff's rule to fit the bases together.

C. They broke the hydrogen bond.

D. They observed the pairing under a microscope.

Given a homogenous liquid mixture of sodium chloride (salt) and water, what would be the best method to separate these substances? Explain this process.

How much energy is lost when one organism consumes another organism? A. 10% B. 90% C. 80% D. 5%

Hypotension, distended neck veins, and muffled heart sounds are classic manifestations of a. congestive heart failure (CHF). b. cardiomyopathy. c. cardiac tamponade. d. myocardial infarction.

Developmental researchers use the term "goodness of fit" to refer to: the match between the mother's and baby's blood type. the tendency of the caregiver to coordinate eye contact and vocalization with a baby.

Tapeworms and planarians are examples from which phylum?

Which word describes an artificial pond with raised edges used for agriculture A) shaduf B) paddy C) aqueduct D) Chinampa

A middle-aged woman is admitted to the coronary care unit with a diagnosis of left ventricular failure resulting from a myocardial infarction. Her history indicated that she was aroused in the middle of the night by severe chest pain.

Even though algae can produce their own food through photosynthesis, they are not part of the Plantae kingdom. Select the reasons why.

The parents of an infant with tetralogy of fallot ask a nurse about the problems involved with this disorder. when answering, what must the nurse consider?

Assume that a plasmid is 4000 base pairs in length and has restriction sites at the following locations: 600, 1000, 2200, and 3800. Give the expected sizes of the restriction fragments following complete digestion.