Each of the following statements about cones is TRUE, EXCEPT which one?
A) Cones enable humans to see color.
B) Color vision is enabled by the presence of three types of cones.
C) Cones are evenly distributed throughout the retina, accounting for visual acuity.
D) Cones require more intense light for activation than rods do.
E) Visual acuity is dependent upon cones and bright light.
C
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If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?
A. 1 B. 100 C. 2000 D. 10,000 E. 20,000
Discuss how environmental factors can have a negative impact on the development of a fetus. What will be an ideal response?
A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem. The earliest physical evidence of the site of a newly forming leaf primordium would be
a. development of chloroplasts in a surface cell of the shoot apical meristem. b. cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem. c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem. d. elongation of epidermal cells perpendicular to the surface of the shoot apical meristem. e. formation of stomata in the epidermal layer of the shoot apical meristem.
Which of these occurs during transcription?
A) The information coded in DNA is copied into mRNA. B) A DNA copy is used to direct the production of a polypeptide. C) A polypeptide is folded into a protein. D) Messages encoded in mRNA are used to build proteins. E) Protein processing is enhanced by enzymes.