Eukaryotic chromosomes are composed of a complex of 60% protein and 40% DNA. This complex is referred to as
A. the histone complex
B. the kinetochore
C. chromatin
D. cohesin
Answer: C
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Squids are examples of ____
a. cephalopods b. pseudopods c. monopods d. gastropods e. polypods
A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein are added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Both bacteria A and bacteria B cells are competent. B. Competence in bacteria B is dependent on the phase of growth. C. Competence in bacteria A is constitutively expressed. D. Neither bacteria A nor bacteria B cells are competent.
Which of these lists contains the four postulates of natural selection?
A. Variation in population, heritable variation, selection, unlimited survival and reproduction B. Uniform population, heritable traits, selection, differential survival or reproduction C. Variation in population, environmental variation, selection, differential survival or reproduction D. Variation in population, heritable variation, selection, differential survival or reproduction
Four __________ glands make a hormone that acts on bone and kidney cells and raises blood calcium level.
Fill in the blank(s) with the appropriate word(s).