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. The ultraviolet patterns are highly visible and attractive to bees.
B. Carotenoid pigments are responsible for the ultraviolet patterns.
C. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites.
D. The ultraviolet patterns repel birds and bats from the flowers.
E. Flowers with ultraviolet patterns usually appear yellow or orange to humans.
D. The ultraviolet patterns repel birds and bats from the flowers.
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Identify which of the operon elements plays the most critical role in determining gene regulation in prokaryotes.
What will be an ideal response?
During prophase, __________ is(are) compacted into visible chromosomes
a. chromatin b. centrioles c. centromeres d. kinetochores e. colchicine
The ____ produce(s) ____, which influences biological rhythms and the onset of sleep
a. pituitary gland; thyroid stimulating hormone b. pituitary gland; adrenocorticotropic hormone c. pineal gland; melatonin d. adrenal cortex; cortisol e. parathyroid glands; parathyroid hormone
Which of the following is part of the initial response to cold temperature?
A. Vasodilation of peripheral blood vessels B. Panting C. Sweating D. Shunting of the blood to the core regions of the body E. Decreased metabolism