In eukaryotic cells, sequences of mRNA removed before translation are called

introns.
anticodons.
exons.
rRNA.
terminators.


introns

Biology & Microbiology

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In a plant, the exchange of gases with the environment involves

a. leaves. b. roots. c. stems. d. all of these

Biology & Microbiology

Concordance refers to

A) percentage of monozygotic twin pairs in which neither express the trait. B) percentage of monozygotic twin pairs in which both express the trait. C) percentage of dizygotic twin pairs in which both express the trait. D) percentage of twin pairs in which both express a trait among pairs in which at least one twin has the trait.

Biology & Microbiology

Which of the following describes the sepal of a flower?

a. a modified leaf that encloses the bud b. a long thin structure that links the stigma to the ovary c. a thin stalk that links the anther to the flower’s base d. a sac-like structure at the tip of the stamen

Biology & Microbiology

At the beginning of each ovarian cycle, which one of the following hormones causes the development of a primary oocyte?

A) estrogen B) LH C) prolactin D) progesterone E) FSH

Biology & Microbiology