Which statement regarding photoreceptors is true?
A) Rods are more sensitive to light than cones.
B) Cones are responsible for night vision.
C) Rods are found at the greatest density at the fovea, the retina's center of focus.
D) Rods contain the visual pigment called photopsin.
Answer: A
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A) genetic mutation B) chromosomal rearrangements C) karyotypes D) epigenetic phenomena E) translocation
One source of trait variations among individuals is the process of fertilization, in which when new combinations of maternal and paternal alleles are produced. What other sources contribute to trait variations within a species?
What will be an ideal response?
What is the function of the midpiece on a sperm cell?
A) to contain the haploid nucleus B) to propel the sperm forward C) to aid the sperm's penetration of the egg D) to provide energy for movement
Which of the following about Naegleria fowleri is true?
A) This bacteria typically feeds off of nutrients in the soil. B) Although debilitating, most patients live long lives. C) Only the flagellated form of the protozoan is infectious. D) Infection occurs when contaminated water is ingested. E) The organism prefers warm stagnant waters.