A digestive system with _____ is able to carry out various tasks of digestion at once
a. bilateral symmetry
b. collar cells
c. a one-way tube, a mouth, and an anus
d. radula
e. a two way sac-like cavity
c
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A cell's DNA molecules contain its genetic material. DNA molecules contain patterns for the production of
a. proteins. b. amino acids. c. phosphates and sugars. d. four kinds of bases. e. proteins, amino acids, phosphates, sugars, and four kinds of bases.
The functional unit of the kidney is the
a. renal pelvis. b. ureter. c. cortex. d. nephron.
Which of the following statements is false?
a. Individuals are injected with antibodies in passive immunity. b. A genetically engineered virus is not as potentially dangerous as a weakened but intact pathogen. c. Allergies occur when the body makes a secondary immune response to a normally harmless substance. d. Allergies are a nuisance but are never dangerous or life-threatening. e. Allergies cause the secretion of mucus, prostaglandins, and histamines.
Unequal crossing over often results in the formation of duplicate copies of existing genes. At what phase of meiosis can unequal crossing over occur, and why does this happen?
What will be an ideal response?