What is the complementary sequence corresponding to the DNA fragment AGTCAG?
A) TCAGUC
B) UCAGUC
C) TCAGTC
D) GACTGA
C
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Galileo's telescopic discoveries of mountains on the moon and spots on the sun were controversial because they suggested that the sun and moon
a. were the same kind of object. b. were not perfect spheres. c. were inhabited. d. orbited each other. e. did not orbit Earth.
Small glaciers, called ______________ glaciers, form along mountains in hollow depressions that are protected from the Sun
Fill in the blank(s) with correct word
An electron is accelerated through a potential difference of 25 000 V. What is the de Broglie wavelength of the electron (in m)?
a. 5.9 × 10^-12 b. 6.8 × 10^-12 c. 6.5 × 10^-12 d. 7.8 × 10^-12 e. 5.5 × 10^-12
Why is a global magnetic field thought to be necessary for life to exist on the surface of a planet?
A) A magnetic field shields the planet from harmful ultraviolet light. B) A magnetic field helps form ozone in the upper atmosphere. C) A magnetic field helps keep the planet's atmosphere from being stripped away by stellar winds. D) A magnetic field helps warm the planet's surface through the greenhouse effect.