A group of individuals of the same species that occupy a particular area is:
a. a population
b. an ecosystem.
c. a specimen.
d. a community.
a
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Complete the following sentence. An exon is _______________________
A. a protein that is clipped out post- translationally B. RNA that is removed during the processing of an RNA molecule and remains inside the nucleus C. part of an intact, mature mRNA that leaves the nucleus D. a transfer RNA that binds to the codon E. a series of amino acids at the end of a new polypeptide that directs transcription to the ER
Which one of the following is a major difference between plants and animals?
A. Animals use sophisticated genetic programs to govern their development and day-to-day functions. Plants do not. B. Plant cells have evolved modifications of the plasma membrane that permit the transfer of information and molecules from one cell to another. Animal cells have not. C. Plants have a meshwork of extracellular molecules that provide structural support and that determine the shape of the cells. Animals do not. D. Animal cells are able to absorb large molecules across their plasma membrane. Plant cells are not.
The members of this subphylum have a three-part body plan: a head, thorax, and abdomen. Among
other structures, their head has one pair of antennae and a pair of mandibles, and their thorax has three pairs of walking legs and often one or two pairs of wings.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
Repressible genes are usually actively transcribed when:a
repressor molecules bind to the promoter. b. the supply of the end product formed by the enzymes encoded by these genes is low. c. tryptophan accumulates in the cell. d. quantities of precursor materials are high. e. there is no other substrate that can be used by the cell.