A karyotype is a(n) __________
A. organelle of eukaryotic cells.
B. stage of prophase I in meiosis.
C. division of the cytoplasmic material following mitosis.
D. organized representation of the chromosomes within a cell.
E. None of the answers are correct
D
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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
What is the term for an inducible whole-body resistance in plants in response to a wide range of pathogens and abiotic stressors?
a. systemic acquired resistance b. hypersensitive response c. vernalization d. abscission e. pathogen resistance response
One disadvantage in excreting urea rather than uric acid is that:a
urea is more toxic than uric acid. b. urea is less toxic than uric acid. c. urea is excreted by respiratory structures. d. urea requires more water for excretion. e. urea is produced from ammonia, not nucleic acids.
Any substance that produces an inappropriate response of the immune system is referred to as a(an)
A) allergen. B) antibody. C) plasma cell. D) allergy. E) perforin.