1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Question: A three base sequence (loop) in TRNA that is complementary to a sequence of three bases in mRNA is
Choices:
A codon
A terminator
An anticodon
A promoter
Question: In eukaryotes transcription takes place in
Choices:
the ribosome
the cytoplasm
the nucleus
the endoplasmic reticulum
Question: What is the main protein in translation
Choices:
RNA polymerase
DNA polymerase
ligase
ribosome
endoplasmic reticulum
Question: The Central Dogma Refers
Choices:
To production of energy in cell
Genetic information passing from RNA to protein by transcription
To inheritance of traits between generations
to the flow of genetic information in cells
Genetic information passing from DNA to RNA by translation
Question: energy conservation is an important reason cells have gene regulation; in other words, cells conserve energy by not making proteins when they don't need them
Choices:
True
False
Question: Which of the following happens to eukaryotic transcript prior to translation
Choices:
a cao is put on one end
a Poly-a tail is added to the other end
splicing
All of the Above
A and B
Question: which protein is the main protein of transcription?
Choices:
RNA Polymerase
DNA polymerase
ligase
ribosomes
Question: The process used by cells to convert the mRNA "message" into a sequence of amino acids is
Choices:
Replicatio
Mitosis
transcription
Translation
Question: a tRNA molecule is "bilingual" because it binds to
Choices:
Codons of mRNA and amino acids
Promoters and terminators
Amino acids in DNA
DNA and mRNA codons
Promoters and Amino Acids
Question: A change in the cells DNA sequence is:
Choices:
An operon
A mutation
Transcription
Translation
Replication
Question: In eukaryotic cells sequences of mRNA that are removed from an mRNA molecule before being translated are
Choices:
Anticodons
Introns
Terminators
Exons
Proteoms
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