What condition may occur in a zygote if a sperm has nondisjunction of the sex chromosomes?
a. cancer
b. down's syndrome
c. klinefelter's syndrome
d. triple x syndrome
Answer: c. klinefelter's syndrome
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Small circular, extrachromosomal DNA segments are known as _______.
A. vectors B. plasmids C. clones D. RNA
The compounds involved in phototropism are ____
a. phototropins b. gibberellins c. cytokinins d. phytoestrogens e. statoliths
If a plant were placed in continual darkness, it would continue to open and close its stomata at
approximately the same time each day. This phenomenon is governed by: a. annual rhythms. b. floral clocks. c. transpiration. d. temporal mechanisms. e. circadian rhythms.
In what way are eyes and eyespots similar to each other?
a. They are both simple. b. They both sense light. c. They are both big. d. They both sense the absence of light.