Which amoung these explains the relationship between the magnification of the lens and working distance of a microscope?
A. As the magnification of the lens increases, working distance decreases.
B.As the magnification of the lens increases, working distance increases.
C.As the magnification of the lens decreases, working distance decreases.
D. They are not related to each other
Ans: A. As the magnification of the lens increases, working distance decreases.
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With regard to DNA topology, which of the following is not a continuous deformation?
A. conformational changes due to stretching B. conformational changes due to thermal motion C. conformational changes due to interaction with proteins D. conformational changes due to interaction with molecules other than proteins E. conformational changes due to DNA strand breakage
All of the following statements are true
concerning phloem tissue EXCEPT that a. it transports plant-manufactured products. b. it stores organic compounds. c. it is composed of living cells. d. only some of its cells have nuclei. e. it does not transport minerals
Which specialized cells receive and respond to stimuli?
A) effectors B) neurotransmitters C) neurons D) nerve impulses
Which of the following are sex hormones?
A) androgens, only B) estrogens, only C) progestins, only D) All of these are sex hormones.