Which of the following statements about the rods and cones in the eye is NOT true?
A. Rods and cones work together to detect the full image.
B. The rods are involved in black and white vision.
C. The cones are better able to detect shades of color.
D. Rods are activated by bright light and cones are better suited to night vision.
E. Rhodopsin is the molecule associated with vision.
Answer: D
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Which of the following is an important model organism for the study of development?
A. Escherichia coli B. hepatitis C C. Drosophila melanogaster D. miRNA
Red blood cells contain 2% salt. What will happen when the cell is placed in a 10% salt solution?
a. The cell will burst. b. The cell will shrink. c. The cell will remain unchanged, but salt will diffuse out of the cell. d. The cell will remain unchanged, but salt will diffuse into the cell. e. The cell will remain unchanged, but water will diffuse out of the cell.
Positive feedback systems restore homeostasis. Indicate whether the statement is true or false
Suppose that you encounter an antigen for the first time. What types of cells stored in your lymph nodes can be activated in case you encounter the antigen again?
A) memory cells B) effector cells C) phagocytic cells D) helper T cells