Each ommatidium of the compound eye of an insect has a biconvex lens and a __________, which
help focus light onto photoreceptor cells known as __________.
a. crystalline cone; retinular cells
b. facet; ocelli
c. rhabdome; cones
d. sclera; rods
e. cornea; rhodopsins
A
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One of the DNA-binding motifs in many eukaryotic organisms that contains a nearly identical sequence of 60 amino acids is known as the
A. non-helical zipper. B. leucine zipper. C. zinc finger. D. homeodomain. E. helix-turn-helix.
Lakes with elevated dissolved nutrients and low water clarity are called ______.
A. lotic B. oligotrophic C. eutrophic D. adibiatic E. headwaters
Which respiratory structure will connect the larynx to the bronchi?
a. Bronchial tree b. Pharynx c. Diaphragm d. Epiglottis e. Trachea
An X-linked recessive gene (c) produces red-green
color blindness. A normal woman whose father was color blind marries a color-blind man. (a) What are the possible genotypes for the mother of the color-blind man? (b) What are the possible genotypes for the father of the color-blind man? (c) What are the chances that the first son will be color blind? (d) What are the chances that the first daughter will be color blind? What will be an ideal response?