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.

If calcium levels within a man's blood drop too low it can result in twitching, depression, coma, or even death. Which characteristic of life is the man being affected by? Living things require energy. Living things reproduce.

Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind. A) 0% B) 25% C) 50% D) 75%

Genetically engineered pork has a higher flesh-to-bone ratio. Which of the following sentences explains how pork is genetically engineered?

A sample of blood that shows clumping after the addition of the anti-b antibodies, and after the addition of the anti-rh antibodies, but no clumping after addition of anti-a antibodies, would be described as type b-negative blood.

You notice you begin to sweat whenever the door to your bedroom is closed. This is most closely related to which step in the scientific method? Question 3 options: forming a conclusion making an observation forming a hypothesis recording data

What do you call the part of the body that switches between the lungs and the esophagus?

What is the symbiotic relationship between hookworms and humans?

Which statements describe how the body maintains homeostasis on a hot day? Check all that apply. The nervous system and the muscular system work together. The muscular system and skeletal system work together.

Through cell respiration, plants get energy from glucose. the energy stored in glucose originally came from

Introducing the gene for bovine growth hormone into the eggs of pigs is an example of a process called