Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. Pituitary gland secretes oxytocin, which acts on the uterusB. Uterine contractions increaseC. Fetus is pushed against uterine openingD. Receptors detect stretchE. Brain receives and compares stretch informationResponse
What will be an ideal response?
B
B. uterine contractions increase
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When assessing the role of conjugative bacteria in the spread of antibiotic resistance genes, it is fair to say that Hfr cells contribute most while F- cells contribute least.
Answer the following statement true (T) or false (F)
Which of the following types of immunoglobulins is most abundant in serum?
A. IgE B. IgA C. IgM D. IgG
What stage of cellular respiration can occur in human cells with or without oxygen present?
A. The electron transport chain B. The Citric acid cycle C. Pyruvate oxidation D. Glycolysis
Answer the following statements true (T) or false (F)
1, Antigen-presenting dendritic cells are found in the skin and in the linings of the respiratory and digestive tracts. 2. The function of dendritic cells is to signal T cells, starting an immune response. 3. Experimental gene therapy can be used to treat a form of severe combined immune deficiency, SCID-X1. 4. People homozygous recessive for a 32-base deletion in the CCR5 gene do not become infected with HIV. 5. Mutation of the CCR5 coreceptor may have enabled people to survive various European plagues during the Middle Ages.