Specialized outgrowths of roots that increase the efficiency of absorbing water from the soil are called 

A. root hairs.
B. nodules.
C. xylem.
D. phloem.


A. root hairs.

Biology & Microbiology

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The group of enzymes able to relax supercoils in DNA is called

A) primases. B) helicases. C) topoisomerases. D) telomeres. E) ligases.

Biology & Microbiology

Estuaries receive nutrients both from tides and from streams and rivers

Indicate whether the statement is true or false

Biology & Microbiology

The immediate ancestors of the genus Homo belonged to the genus:a

Australopithecus. b. Pongo. c. Pan. d. Sahelanthropus. e. Ardipithecus

Biology & Microbiology

Which of the following is (are) proposed to be a function of telomeres?

a) They are required for the complete replication of the chromosome. b) They prevent the ends of chromosomes from fusing with one another. c) They form caps that protect the chromosomes from nucleases and other destabilizing influences. d) All of the choices are correct.

Biology & Microbiology