In a plant cell, DNA may be found _____

A) only in the nucleus
B) only in the nucleus and chloroplasts
C) in the nucleus, mitochondria, and chloroplasts
D) in the nucleus, mitochondria, chloroplasts, and peroxisomes


C

Biology & Microbiology

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Histology is the study of

(a) cells. (b) organelles. (c) tissues. (d) organisms.

Biology & Microbiology

Which of the following is an application of transposon tagging?

A. To test if a transposon is replicative B. As a tool to clone novel genes C. To track the movement of transposons between species D. To inactivate transposons in a genome

Biology & Microbiology

The age of a fossil can often be determined using radiometric dating of the rocks in which the fossil is found. Because uranium-238 has a half-life of 4.5 billion years, it means that:

A. when it is 9 billion years old, a rock will have no uranium-238 remaining. B. when the earth is 9 billion years old, no uranium-238 will exist. C. a uranium-containing rock that is 4.5 billion years old would, today, have only about half as much of its uranium in the form of radioactive uranium-238 as a rock that was just recently formed. D. uranium-238 cannot be used to establish the age of fossils greater than 4.5 billion years old.

Biology & Microbiology

The number of hosts in the life cycle of a tapeworm is 

A. one. B. two. C. three. D. different for different types of tapeworms.

Biology & Microbiology