An intrauterine device
A. is used to cause abortions.
B. prevent births.
C. is a permanent form of birth control.
D. All of the above are correct.
B. prevent births.
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Answer the following statements true (T) or false (F)
1. Studies by Avery, MacLeod, and McCarty with different strains of bacteria and those by Hershey and Chase with T2 bacteriophage determined that proteins are highly complex molecules that form the genetic material for bacteria and viruses. 2. A strand of DNA is composed of nucleotide bases, sulfate groups, and sugars. 3. When considering the complexity of genetic material, multiple genes are found within a chromosome. 4. If there is 28% adenine, then there must be 28% cytosine for the DNA composition of a particular organism. 5. DNA is a double helix structure whose strands are held together by hydrogen bonds with A to T and C to G base pairing.
The placenta
A) is where blood cells form before the fetus has bone marrow. B) nourishes the fetus and secretes hormones that maintain the pregnancy. C) is a membrane surrounding the embryo that gives rise to the blood vessels in the umbilical cord. D) is the membrane that contains the fetus.
In living organisms, chemical reactions responsible for growth, repair, and nutrition are collectively referred to as:
a. development b. metabolism c. adaptation d. genetics e. homeostasis
Genetic drift is more common in large populations than in small populations
Indicate whether the statement is true or false