41) Which of the following the best description of a : 1380820

41) Which of the following the best description of a : 1380820.



41) Which of the following is the best description of a gene?

A) a protein whose amino acid sequence is encoded in a segment of DNA

B) a collection of millions or billions of base pairs of DNA, encoding many proteins

C) a segment of DNA that is transcribed into an mRNA, a tRNA, or an rRNA

D) a segment of mRNA that is translated into a protein

E) A section of the nucleus where transcription takes place.


42) In order for a gene to be transcribed, a multipart protein complex must bind to the ________ to help RNA polymerase align with it.

A) enhancer

B) promoter

C) intron

D) exon


43) Hoxc8 genes are responsible for the development of:

A) abdominal structure in vertebrates.

B) thoracic structures in vertebrates.

C) cranial structures.

D) limbs in vertebrates.

E) the whole vertebrate body.


44) Hoxc8 is nearly identical in all animals, but Hoxc8 enhancer differs in:

A) the sequence of amino acids.

B) the RNA base sequence.

C) the DNA base sequence.

D) DNA-binding proteins.

E) the DNA base sequence and its DNA-binding proteins.


45) Which of the following statements is true about micro-RNAs?

A) Alternative splicing converts them into mRNAs.

B) They bring amino acids to the ribosome.

C) They regulate the amount of protein in a cell by interfering with mRNAs.

D) They are too small to be of any use to the cell.

46) The genomes of human beings and chimpanzees are nearly identical, so why are humans and chimps so different?

A) The genes of chimps make different proteins.

B) Out of 907 genes in the liver of both humans and chimps, only half are active in chimps.

C) The micro RNAs destroy mRNAs in chimps.

D) The micro RNAs destroy DNAs in chimps.

E) The regulatory sequences are different in the two species.


47) The full complement of DNA found in a cell of your body constitutes your:

A) coding sequences.

B) non-coding sequences.

C) genome.

D) genetic code.


48) Alternative splicing is:

A) removing introns and retaining exons.

B) removing exons and retaining introns.

C) when a single primary transcript is edited in different ways to yield multiple mRNAs.

D) converting an exon into an intron.


49) Dietary factors are now being studied for how they regulate gene activity and how this contributes to disease. For example, how does a diet high in unsaturated fatty acids help maintain a healthy blood lipid profile? Within hours of feeding animals with diets rich in polyunsaturated fatty acids (PUFAs), there is an increase in the activity of genes responsible for making enzymes that break down fats and a reduction of the activity of genes responsible for making enzymes that make fats. This has the effect of changing fat metabolism, which leads to a lowering of blood lipid levels. The control of what type of DNA sequence would PUFAs most likely be affecting?

A) intron sequences

B) exon sequences

C) enhancer sequences

D) micro-RNA sequences

50) What accounts for the fact that cells in different tissues and organisms have different functions and respond differently to their environments?

A) The cells use the same genes to make different proteins.

B) The cells have different genes.

C) The cells are expressing (using) different genes.

D) The cells use different genetic codes.

E) The cells DNA is different.



41) Which of the following the best description of a : 1380820

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