Earthworms have photoreceptors, but do they have vision?
What will be an ideal response?
No, although they can sense light, they do not have vision. Vision is detection of light in a way that provides a mental image of objects in the environment. It requires eyes and a brain with a capacity to interpret visual stimuli. Eyes are sensory organs with photoreceptors.
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The immunoglobulin superfamily includes a wide variety of soluble and cell-bound proteins important in the immune response. These proteins can be best described as sharing:
A. a nearly identical primary structure. B. a nearly identical primary structure, and similar structural motifs and function. C. limited to close sequence similarity, and similar structural motifs and function. D. none to limited sequence similarity, and similar structural motifs and function. E. limited to close DNA-coding sequences, and similar structural motifs and function.
The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation, because the girls
A) share tissues that descend from ectoderm, endoderm, and mesoderm. B) share only tissues derived from mesoderm. C) were born on time. D) have two separate nervous systems.
A large deletion removes the promoter and first three exons of a gene. No mRNA or protein is detected. What type of allele is this mutant allele?
A) hypomorphic allele B) hypermorphic allele C) null allele D) antimorphic allele
The Cambrian explosion of life is most notable for the:
A) movement of life from the oceans to the land masses, including all kingdoms. B) appearance of the first photosynthetic organisms. C) appearance of stromatolites. D) appearance of multicellular animals, including nearly all phyla of the animal kingdom.