To prevent dehydration, reptiles have
A) scaly skin.
B) embryos that lack gills.
C) moist, slime-covered skin.
D) eggs that contain no water.
E) a four-chambered heart.
A
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Triglycerides are used to coat skin, hair and feathers of animals to keep them protected, lubricated and pliable
Indicate whether the statement is true or false.
Which of the following traits is an X-linked recessive disorder?
A. Marfan syndrome B. cystic fibrosis C. sickle-cell disease D. color blindness E. Tay-Sachs
A blocked coronary sinus would block blood flow:a
into the superior vena cava. b. into the inferior vena cava. c. into the pulmonary arteries. d. returning from the pulmonary arteries. e. returning from the coronary circulation.
Suppose that a mistake made during DNA replication in a cell is not corrected, but instead the mutation remains in the single strand where it occurred. Then suppose that after the cell divides, both daughter cells survive, and those cells then go on to have DNA replication, and ultimately cell division. Four cells now exist where there once was one cell. Assume that the mistake was never corrected and that no other mistakes occurred. How many of the four cells will have the mutation in their DNA?
a. three b. two c. one d. none