Which organism contains the most energy?

• Rabbit
• Grains
• Birds
• Mice

Tags

NGSS.HS-LS2-4

Which four structures are found in all cells?

• DNA, ribosomes, cytosol, and a cell membrane
• nucleus, ribosomes, cytosol, and a cell membrane
• nucleus, ribosomes, cytosol, and mitochondria
• DNA, cell wall, cytosol, and a cell membrane

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

What is the corresponding codon for AGT?

• UCA
• TCA
• UGA
• ACU

Which of the following does not occur in prokaryotic gene expression but does occur in eukaryotic gene expression?

• mRNA, tRNA, and rRNA are transcribed
• RNA polymerase binds to the promotor
• a poly-A tail is added to the ends of the mRNA
• Transcription can begin as soon as translation has begun even alittle

Transcription in eukaryotes requires which of the following in addition to RNA polymerase?

• the protein  product of the promotor
• start and stop codons
• ribosomes and tRNA
• several transcription factors

What is the function of the poly-A tail in mRNA?

• to add modified guanin to the 3' end of the mRNA
• to indicate the site of translational termination
• to code for the binding of RNA polymerase to the DNA
• to help protect the mRNA from degradation by hydrolytic enzymes 

What is a ribozyme?

• enzyme that uses RNA as a substrate
• RNA with enzymatic activity
• an enzyme that catlyzes the association between the large and small ribosomal subunits
• an enzyme tha synthesizes RNA primers during DNA replication

What is the anticodon on the tRNA that binds to mRNA codon for the DNA coding sequence AAA?

• TTT
• UUU
• UUA
• AAA

What is the effect of a nucleotide-pair substitution that results in a nonsense mutation in a gene?

• it changes an amino acid in the encoded protein
• It has no effect on the amino acid sequence of the encoded protein
• it introduces  premature stop codon into the mRNA
• it alters the reading frame of the mRNA

Tags

NGSS.HS-LS3-2

Which is the best description of a gene?

• a DNA sequence that is expressed to form a functional product; either RNA or polypeptide
• a DNA subunit that codes for a single complete protein
• a DNA-RNA sequence combination that results in an enzymatic product
• a descrete unit of hereditary information that consists of a sequence of amino acids 

Tags

NGSS.HS-LS1-1