The proteins that enable the HIV virus to bind to cells are typically CD4 and CCR5. On what type of cells are these proteins typically observed?
A) plasma cells
B) dendritic cells
C) effector helper T cells
D) memory helper T cells
E) both C and D
E
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A hypothesis must be testable to be scientifically valid. Being testable means that _____.
Fill in the blank(s) with correct word
Two men may be the father of a child. Figure 8.2 shows the results of a DNA fingerprint analysis to determine paternity. M is the mother, C is the child, A and B are the two men. What is the best interpretation of these results?
A. The man identified as A is probably the father. B. The man identified as B is probably the father. C. Neither man is this child's father. D. Either man could be this child's father. E. Paternity cannot be determined from this data.
Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration). All of the following are concerns regarding the use of triclosan, except
A. Wide spread regular use of triclosan could interfere with the maintenance of healthy normal microbiota. B. These are all concerns that have been expressed about triclosan use. There are no exceptions here. C. There are concerns that triclosan may be a hormone disruptor. D. Wide spread use of triclosan may favor the survival and growth and of highly resistant bacteria. E. Scientific evidence does not demonstrate that triclosan-supplemented soaps are any more effective than plain soap and water for hand hygiene.
"Synapses are connections between the axon of one neuron and the dendrite of another neuron, where neurotransmitters transmit a chemical signal." How would you modify this statement to make it more complete? (Check all that apply.)A) The statement needs no modification.B) Synapses can also form between an axon and a cell soma.C) Neuromuscular synapses form between the axon of a neuron and a muscle.D) Synapses often form among the parts of a single cell.E) Synapses can be electrical as well as chemical.
What will be an ideal response?