Based in the figure above, after fertilization, which cell(s) give(s) rise to the embryo plant?
A) A
B) B
C) C
D) D
E) E
Answer: B
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What is the route of water in the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
The flies with variegated eye color had what abnormal chromosome structure?
A) X-chromosome inversion that moves the w+ gene to a different orientation on the chromosome in some cells following X-ray exposure B) X-chromosome translocation that moves the w+ gene to a region of heterochromatin on another chromosome in some cells following X-ray exposure C) a mutation in the w+ gene following X-ray exposure that causes the gene to be overexpressed in a tissue-specific manner D) X-chromosome deletion that deleted the w+ gene in some cells following X-ray exposure E) a mutation in a somatic chromosome that causes the w+ gene to be translocated to the X-chromosomes following X-ray exposure
Which of the following accurately states the goal of biological classification?
a) the acknowledgement that ancestral eukaryotes gave rise to ancestral bacteria and archaeans b) a way to include all biological entities, including viruses, in the tree of life c) the separation of all organisms into four separate kingdoms d) the grouping of organisms into categories that reflects their evolutionary history e) the grouping of organisms into three large polyphyletic categories
Organelles are:
A) organisms. B) like tiny organs within cells. C) a group of cells that serve a common function. D) cells. E) proteins.