The main target of the HIV virus is
A. red blood cells.
B. B cells.
C. cytotoxic T cells.
D. memory T cells.
E. CD4+ cells (macrophages and helper T cells).
Answer: E
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The phenotype expressed by a single genotype can be affected by environmental conditions
Indicate whether the statement is true or false
Why can mature plants be cloned to produce genetically identical copies?
A) Mature plant cells contain only a fraction of the genes found in an adult plant. B) Plants have evolved over time to suit the need of human agriculture. C) Mature plant cells can develop into all the specialized cells of an adult plant. D) Scientists have engineered all plants to have this ability.
Which type of neuroglia is found outside of the brain?
A. microglia B. axons C. astrocytes D. Schwann cells E. oligodendrocytes
Which method often results in colonies developing down throughout the agar and some colonies on the surface?
What will be an ideal response?