Which of the following does not occur during the first trimester of pregnancy?
A. All of these events occur during the first
trimester.
B. cleavage
C. gastrulation
D. organogenesis
E. sex determination
A
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Which statement about diversity in eye development is not correct?
A. Planaria have the simplest eyes, which are basically pit-shaped cells containing photoreceptors. B. Evolution of the spherical lens improved images as animals evolved. C. Both squids and vertebrates have singlelens eyes, but they are very different in their development, anatomy, and physiology. D. The percentage of living animals possessing true eyes that can produce an image is small. E. Compound eyes consist of hundreds of small lenses arranged on a convex surface.
Which of the following statements is false?
a. Neurons in the brain can interpret incoming action potentials only in certain ways. b. Optic nerve impulses can only be interpreted as light. c. Sensory neurons do not follow the all-or-none law. d. The stronger the stimulus, the more action potentials are generated. e. A strong stimulus activates many adjacent receptors, thereby increasing the number of action potentials and the level of awareness for the stimulus.
Protein interaction networks may be characterized by all of the following approaches except
a. gentle isolation followed by mass spectrometry. b. shotgun sequencing of random DNA clones. c. screening for protein interactions in vitro. d. the yeast two-hybrid method.
An example of a flagellate parasite (Mastigophora) is
What will be an ideal response?