Which of the following statements about the humoral immune response is true?
A) The humoral immune response defends against bacteria and viruses by activating T cells.
B) The humoral immune response defends primarily against bacteria and viruses present in body fluids.
C) The humoral immune response plays a major role in protecting the body from cancerous cells.
D) The humoral immune response is the result of macrophages producing antibodies.
Answer: B
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Answer the following statements true (T) or false (F)
1. The outgroup in this cladogram of vertebrate animals is the amphibians. 2. Mammals diverged from a common ancestor of all of these vertebrates more recently than crocodiles diverged from a common ancestor of birds. 3. Lizards and mammals are proposed in this cladogram to be more closely related than lizards and birds. 4. A biological species is defined as a population whose members can interbreed. 5. Today, scientists can deduce evolutionary relationships by DNA sequence analysis.
If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a) 2 spot × 2 spot yields 2 spot and 4 spot (b) 2 spot × 4 spot yields only 2 spot (c) 2 spot × 4 spot yields 2 spot and 4 spot (d) 2 spot × 2 spot yields only 2 spot (e) 4 spot × 4 spot yields only 4 spot What will be an ideal response?
The direct visualization of a developing fetus to diagnose disorders is called
a. chorionic villus sampling. b. preimplantation diagnosis. c. amniocentesis. d. fetoscopy. e. senescence.
Much precipitation in the tropical rain forest is derived from:a
evaporation from lakes. b. evaporation from rivers. c. groundwater. d. transpiration. e. translocation.