The gonads produce steroids. The specific steroid-producing organelle in gonad cells is
A. contractile vacuole.
B. ribosomes.
C. mitochondria.
D. lysosomes.
E. smooth endoplasmic reticulum.
Answer: E
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In Drosophila, the genes y (yellow body) and car (carnation eyes) are located at opposite ends of the X chromosome. In doubly heterozygous females (y+car+ / ycar), a single chiasma is observed somewhere along the X chromosome in 90% of the examined oocytes. No X chromosomes with multiple chiasmata are observed. What percentage of the male progeny from such a female would be recombinant for y and car?
A) 5% B) 10% C) 45% D) 55% E) 90%
Effector B cells secrete antibodies that are ____ those produced by the original B cell from which they arose, which
then ____.
a. identical to; flag antigens for phagocytosis and prevent them from attaching to body cells b. different than; help antigens attach to body cells c. identical; prevent antigens from clumping together to d. different than; present them on the surface of dendritic cells e. in addition to; flag antigens for elimination by urination
Which of the following behavior patterns is limited
to the most highly evolved animals? a. imprinting b. insight learning c. fixed action patterns d. instinctive behavior e. classical conditioning
An arthropod exoskeleton is composed of
A) chitin. B) calcium carbonate. C) cellulose. D) lignan. E) silica.