There are between 20,000 and 25,000 genes in the human genome, yet our cells are capable of producing more than 90,000 different proteins. How is this possible?
A) Introns are spliced back together to form mRNAs.
B) Micro-RNAs can also be used to make proteins.
C) Primary transcripts can be edited in different ways by alternative splicing to produce different mRNAs.
D) Many genes are actually yet to be discovered.
Answer: C
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During _________, nucleotide sequence information is changed into amino acid sequence information.
A. replication B. sequencing C. transcription D. translocation E. translation
Although the genetic contributions of egg and sperm
nuclei are equal, the egg contributes more to cell differentiation because of a. its energy reserves. b. its cytoskeletal elements. c. its specialized proteins. d. its maternal messages. e. all of these.
What is a replication bubble?
A) A complex of replication enzymes on the DNA template strand B) A DNA sequence that initiates replication C) A tangle of denatured DNA strands near the replication fork D) A locally denatured segment of DNA where replication originates E) A localized site in the nucleus where chromosomes are replicating
An enzyme can
A. reduce the rate of a chemical reaction. B. increase the rate of a chemical reaction as much as two times. C. increase the rate of a chemical reaction as much as ten times. D. increase the rate of a chemical reaction as much as several thousand times.