AP Protein Synthesis

During translation in a eukaryotic cell __________.

• polypeptides are synthesized at ribosomes, according to instructions carried by mRNA

• ribosomes move into the nucleus

• ribosomes move out of the nucleus

• all of these

Which of the following summaries of protein synthesis is correct?

• The mRNA is made on a DNA template, and then amino-acid-bearing tRNA’s bind to it through codon-anticodon pairing.

• DNA transposons leave the nucleus, are transported to a ribosome, and catalyze the polymerization of amino acids in a protein.

• DNA strands separate in the nucleus to form mRNA. mRNA leaves the nucleus and is transcribed into tRNA on ribosomes.

• DNA exchanges its thymine units with uracil (U) in polymerase. This activates polymerase, and it starts joining amino acids together.

Tags

NGSS.HS-LS1-1

Which of the following statements correctly describes mRNA processing?

• Introns are cut out of the primary transcript, and the resulting exons are spliced together.

• Introns are cut out of the primary transcript and spliced together at the end of the transcript.

• Exons are cut out of the primary transcript and transported to the endoplasmic reticulum.

• all of these

Which of the following catalyzes the linkage between ribonucleotides to form RNA during gene expression?

• tRNA

• reverse transcriptase

• RNA polymerase

• RNA ligase

The number of nucleotide bases "read" together on the mRNA to designate each amino acid is _____; this unit is called a(n) __________.

• three … codon

• two … dipeptide

• one … amino acid

• three … triose

Genetic information of eukaryotic cells is transferred from the nucleus to the cytoplasm in the form of __________.

• RNA

• DNA

• proteins

• amino acids

When RNA is being made, the RNA base __________ always pairs with the base __________ in DNA.

• U:T

• U:A

• G:U

• T:U

All organisms use the same genetic code, so it is possible to produce human proteins using another organism's protein synthesis machinery.

• true

• false

Tags

NGSS.HS-LS1-1

When genes are expressed, they produce __________.

• polypeptides

• enzymes

• pathways

• glucose

Tags

NGSS.HS-LS1-1

In the absence of a nucleus, prokaryotes can simultaneously transcribe and translate the same gene.

• true

• false