In Africa and other parts of the world, malaria parasites can cause deadly illness. Individuals who are heterozygous for sickle-cell anemia can produce a resistance to the malaria infection. This is known as
A. heterozygote disadvantage.
B. heterozygote advantage.
C. polygenic inheritance.
D. pleiotropy.
E. homozygote advantage.
B. heterozygote advantage.
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In the nucleotide sequence ACTGG, what does
C stand for?
a. cysteine b. cytotic c. cytosine d. chargaff e. cystomitosine
Which of the following is NOT true of chlorofluorocarbons?
a. They can destroy ozone. b. They are odorless. c. They are a greenhouse gas d. They break down very slowly. e. Their action is allowing more UV radiation through the atmosphere
A region of plant tissue where sugars are being produced or released from storage is called ____.
A. cortex B. plasmodesmata C. stoma D. a source E. a sink
All of the following contributes to pathogenicity EXCEPT:
a. enzymes b. capsules c. toxins d. allergic reactions