Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is not correct?
A. Flowers with ultraviolet patterns usually appear yellow or orange to humans.
B. Carotenoid pigments are responsible for the ultraviolet patterns.
C. The ultraviolet patterns are highly visible and attractive to bees.
D. The ultraviolet patterns repel birds and bats from the flowers.
E. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites.
Answer: D
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If the PAX6 gene from a human is inserted into an eyeless mutant fly, what would happen?
a. nothing; human genes cannot be expressed in other species b. the fly will grow normal compound fly eyes in the normal location c. compound eyes will form wherever the gene is expressed d. the fly will develop aniridia e. the fly will grow simple human eyes in the normal location
A/the ____ detects a stimulus and sends this information to the nervous system
a. gland b. muscle
c. brain stem d. sensory receptor e. hypothalamus
In an estuary, the zone of maximum vertical difference in density of water layers is called the
A) thermocline. B) pycnocline. C) mixing zone. D) hypolimnion.
What name is given to the specific location of a gene on a chromosome?
A) locus B) phenotype C) genotype D) allele