HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells
B. memory B cells
C. helper T cells
D. monocytes
E. natural killer cells
C. helper T cells
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Which of the following statements is NOT true of the blastopore?
A. It is the opening from the blastocoel to the outside. B. It is the opening from the archenteron to the outside. C. It can develop into the mouth of the adult in some animals. D. It can develop into the anus of the adult in some animals. E. It occurs in both protostomes and deuterostomes.
The excretory system uses oxygen because oxygen diffuses more rapidly into the excretory system because it contains water in the urine.
a. true b. false
With regards to prokaryotes and eukaryotes, all of the following are true except
The spread of hepatitis D is preventable by the hepatitis D vaccine.
Answer the following statement true (T) or false (F)