Which of the following is a receptor that responds to light?
A. gibberellins
B. phototropin
C. cytokinins
D. phytochrome
E. Phytochrome and phototropin are correct.
Answer: E
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What is the name of the syndrome that produces the XXY combination of sex chromosomes?
A. Klinefelter syndrome B. Down syndrome C. Turner syndrome D. Jacob's syndrome
Carotenoids are important to many plants because these pigments are able to
A. remove carbon dioxide from the air. B. absorb wavelengths of light that neither chlorophyll a nor b can absorb. C. absorb water so that hydrolysis can be carried out in the chloroplasts. D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. E. store electrons for use during the "dark" reaction of photosynthesis.
Marbles is a Manx cat whose tail is so short that she appears not to have one. The genotype for short tail in Manx cats is heterozygous (Mm). Cats that are genotype mm have normal length tails, but cats that are genotype MM die before birth due to highly abnormal brains and spinal cords. Marbles has one copy of a dominant ________ allele.
A) pleiotropic B) penetrant C) lethal D) polymorphic
A characteristic that sets the endocrine system apart from the nervous system as a communication system is that endocrine control tends to be faster than nervous control.
a. true b. false