The letter “A” in the above figure represents
a. trigger zone.
b. output zone.
c. input zone.
d. conducting zone.
e. none of these.
Answer: c
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In a newly fertilized egg, the vitelline layer _____
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter B) lifts away from the egg and hardens to form a fertilization envelope C) secretes hormones that enhance steroidogenesis by the ovary D) reduces the loss of water from the egg and prevents desiccation E) provides most of the nutrients used by the zygote
The first intelligence tests, developed in the late 19th century, tested a person's
A) mathematics and verbal skills. B) sensory perception and reaction time. C) problem-solving and logic skills. D) hand-eye coordination.
The patterns by which muscles connect to bones are the same in all vertebrates
Indicate whether the statement is true or false.
________ are cyclic nitrogenous bases with two rings and pronounced aromatic properties.
A. Quinones B. Purines C. Amino acids D. Fatty acids