Carotenoids are accessory pigments that ____
a. absorb yellow and red light to assist in photosynthesis
b. capture energy from light and use it directly in cellular respiration
c. are masked by the presence of chlorophyll throughout the growing season
d. absorb blue and violet wavelengths and reflect green and yellow
e. reflect blue wavelengths
ANSWER: c
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In a conjugation experiment not all of the cells receiving two genes will demonstrate an altered phenotype for both genes. What is the most likely explanation of this phenomenon?
A. One gene is toxic to the cell B. Transferred genes must undergo recombination for genotypic conversion of the recipient cell and there is a possibility that only one gene will be recombined into the recipients chromosome C. The transferred DNA is rapidly degraded by the recipient cell and one gene can be degraded before it is recombined into the host chromosome D. It is not physically possible to recombine more than one gene into a single host genome per conjugation event
Individuals with three or more copies of each of their chromosomes are called ____
a. polyploids b. haploids c. aneuploids d. euploids e. diploids
The step of DNA replication in which the replication proteins open up the double helix and prepare for complementary base pairing is called
A) initiation. B) elongation. C) termination. D) translation. E) translocation.
Down syndrome involves trisomy
a. 3. b. 5. c. 15. d. 19. e. 21.