What characteristics do many deep-sea fish have regarding their eyes?
a. They have spheroid eyes and one retina
b. They have tubular shaped eyes and one retina.
c. They have tubular shaped eyes and two retinas.
d. They have spheroid eyes and two retinas.
c
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Integrase
A. is required for prophage formation. B. cuts viral genomes. C. is required for genome entry into the bacteria. D. is required for provirus formation. E. cuts the viral genome and is required for both prophage and provirus formation
Meselson and Stahl distinguished between parental and newly-synthesized DNA by using
A) heavy metal. B) heavy and light forms of nitrogen. C) nucleic acid dyes. D) chromosome paints.
Which of the following is false?
a. All mammals have either an estrous or a menstrual cycle. b. Some primates have a menstrual cycle. c. Some female primates may be physically and behaviorally receptive to sexual activity at any time. d. About 10% of detected pregnancies end in miscarriage. e. Mifepristone (RU-486) is approved to indiuce abortion any time during the first six months.
__________ refers to nutrient enrichment of any
ecosystem that is otherwise low in nutrients. Fill in the blank(s) with the appropriate word(s).