The simplest nervous system found in nature is the nerve net. An example of an organism that senses and responds to its environment with this ancient system would be
A. a fiddler crab.
B. a frog.
C. a jellyfish.
D. a cockroach.
E. an earthworm.
Answer: C
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Which one of the following statements about homeotic, or Hox, genes is not correct?
A. Drosophila contain 8 Hox genes arranged in two clusters, the Antennapedia complex and the Bithorax complex. B. Hox genes are arranged in order according to their relationship with the anterior-posterior segmentation. C. Timing of expression corresponds to chromosomal order and location of expression. For example, anterior genes "turn on" earlier compared to those expressed in the posterior. D. The linear order of Hox genes along the chromosome, the anterior-posterior orientation of the embryo, and timing of expression for the genes in Hox clusters is observed only in Drosophila. E. Many of the genes in the mammalian Hox clusters have redundant or overlapping functions.
Explain how the resulting phenotypic ratios from Mendel’s dihybrid cross assisted him in framing his Second Law. What will be an ideal response?
This bacterium is unique in that it does not possess a flagellum but is motile by gliding motility
a. Acidovorax spp. b. Sphingobacterium spp. c. Spingomonas spp. d. Pseudomonas spp.
The accumulation of greenhouse gases leads to reflection of heat from the Earth's surface in the atmosphere and is often called "global warming." However, with the changes in patterns of wind, precipitation, and ocean temperature also involved, the term ________ _______is more accurate.
What will be an ideal response?