A bruise appears as a greenish spot in the skin because
A) hemoglobin has leaked from the blood into the injury and hemoglobin has a green color.
B) the heme group in the hemoglobin has broken down into biliverdin.
C) bilirubin from iron recycling has built-up in the bruise.
D) red blood cells lyse releasing biliverdin from inside.
E) dead white blood cells accumulate at the site of injury.
B
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________ are proteins that connect adjacent cells at a gap junction
A) Bindins B) Adhesions C) Connexins D) Attachons E) Tieons
Which of the following statements about the first trimester is false?
A) The events that occur during the first trimester are very complex. B) Only about 40 percent of conceptions survive the first trimester. C) During this trimester, cleavage, implantation, placentation and embryogenesis occur. D) The fetus gains the most weight during the first trimester. E) It consists of 10 developmental weeks.
The term polar is used to describe molecules because
A) such molecules are always linear in shape. B) there are at least two distinct ends of the molecule regarding electron position and the resulting charge. C) there are at least two distinct ends of the molecule regarding hydrogen placement. D) polar covalent molecules are found in colder climates. E) polar covalent molecules were first discovered in polar bears.
Hematopoiesis refers only to the production of those blood cells which respond to infectious organisms in the body
a. true b. false