Rods and cones are located in the
a. lens.
b. cornea.
c. pupil.
d. iris.
e. retina.
E
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Based on the phylogenetic tree shown, to which of the following groups listed below is a bird most closely related?
A. turtle and snake B. human C. snake only D. frog E. turtle only
In a conjugation experiment not all of the cells receiving two genes will demonstrate an altered phenotype for both genes. What is the most likely explanation of this phenomenon?
A. One gene is toxic to the cell B. Transferred genes must undergo recombination for genotypic conversion of the recipient cell and there is a possibility that only one gene will be recombined into the recipients chromosome C. The transferred DNA is rapidly degraded by the recipient cell and one gene can be degraded before it is recombined into the host chromosome D. It is not physically possible to recombine more than one gene into a single host genome per conjugation event
Botox is a toxin produced by the bacterium Clostridium botulinum. When ingested with tainted food, botox can cause distress by paralyzing the intestines, and, in high doses, can kill by paralyzing muscles needed for breathing and heartbeating. Why would botox be an adaptation for Clostridium botulinum?
A. Botox allows the bacteria to gain more oxygen. B. Botox prevents other bacteria from entering the gut. C. Botox prevents antibiotics from entering the gut. D. Botox allows the bacteria to gain more food. E. Botox prevents the intestines from removing the bacteria.
The letter "A" in the above figure is
a. the epidermis. b. the sweat gland. c. the dermis. d. the hypodermis. e. none of the above