Pre mrnas - Study guides, Class notes & Summaries

Virology Practice Test 32 Questions with Verified Answers The difference between "simple" retrovirus and "complex" retrovirus is? A) "Simple" retroviruses do not cause disease B) "Complex" retroviruses contain additional genes called accessory genes C) "Simple" retroviruses do not cause tumors D) "Complex" retroviruses carry viral oncogene E) Only "complex" retroviruses produce provirus - CORRECT ANSWER B, E What is the first biosynthetic event that occurs in cells i...

What is the first mRNA processing step? - ANSWER 5' capping Different mRNAs are made from the same initial pre-mRNA by ________. - ANSWER alternative splicing RNA transcription begins at a ________. - ANSWER promoter ________ protect(s) the pre-mRNA molecule. - ANSWER the 3' poly-a tail The process of pre-mRNA splicing removes ________. - ANSWER introns Spliced ________ differ in their exons. - ANSWER mRNAs Identify the three phases of transcription. - ANSWER initiation, elongation, te...

Virology Exam 2 Questions with 100% Correct Answers What type of virus is zika virus and how is it spread? - Flavivirus family; spread by mosquitoes which statement about polyadenylation of DNA viruses mRNAs is correct? a. it always occurs in the cytoplasm b. it occurs after cleavage of pre-mRNA c. polyA is added at the 5' end of pre-mRNA d. is specified by a stretch of U residues in the template - b adenovirus E1A protein stimulating the expression of adenovirus E2 protein which th...

which of the following statements regarding a DNA double helix is always true? - the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine working in a coroner's office, you are investigating the mysterious death of a person found in the wooded area in the spring of the year. during a cellular analysis of this body, you learn that the levels of mRNA that can be obtained from critical tissues are very low, and you find mushrooms in...

RNA nucleotide base pairings - Cytosine (C) pairs to Guanine (G) Adenine (A) pairs to Uracil (U) DNA Sructure - because of this complementary base pairing, the order of the bases in one strand determines the order of the bases in the other strand Griffith's Experiment - in the 1920's, Frederick Griffith worked with two strains of Streptococcus pneumoniae bacteria. It was discovered that DNA was transmitted between the toxic and the harmless bacteria. DNA - -deoxyribonucleic acid -store...

Bio Core II Exam 1 | Actual Exam Questions | 100% Correct Answers | Verified 2024 Version which of the following statements regarding a DNA double helix is always true? - the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine working in a coroner's office, you are investigating the mysterious death of a person found in the wooded area in the spring of the year. during a cellular analysis of this body, you learn that the...

• DNA = phosphate + deoxyribose sugar + A/T/C/G o Contains two strands. The strands are antiparallel (opposite each other). o 5’ → 3’ 3’ ← 5’ • RNA = phosphate + ribose sugar + A/U/C/G o Single strand, can fold back onto itself and form pairs between itself (stem‐loop). • Each nucleic acid is made up of polymers (many monomers) that are called nucleotides. o Nucleotides contain one or more phosphates, a five‐carbon sugar, and a nitrogen base. o Nucleotides are alway...

alternative splicing - - Splicing of introns in a pre-mRNA that occurs in different ways - leads to different mRNAs that code for different proteins - Increases the diversity of proteins. dna transcription vs replication - - replication synthesizes new (daughter) DNA - transcription of DNA forms RNA does the structure of the DNA (nucleosomes) impact the ability of the RNA polymerase to transcribe genes? - - yes - tightly bound nucleosomes, it's harder to get to the DNA so there is less e...

RNA pol II transcripts are processed (1 point): - ANSWERS: co-transcriptionally An unprocessed mRNA is known as a (1 point): - ANSWERS: primary transcript (also known as pre-mRNA) Name three processing steps that occur on eukaryotic mRNA - ANSWERS: Addition of 5' cap, addition of 3' poly A tail, removal of introns (splicing) The 'Shatkin experiment' used radio-labeled capped and uncapped mRNA to show that in addition to protection, the 5' cap is also required for - ANSWERS: Require...

Eukaryotic pre-mRNAs undergo three processing steps to become mRNA. What are they? 1. 5' cap addition 2. 3' poly-A tail addition 3. Splicing What stimulates resting B-cells to become plasma cells, divide and secrete antibody? Finding its target/binding of antigen to the antibody displayed on its surface How many different polypeptide chains are in a IgG-antibody Two (two copies of heavy chain & two copies of light chain) If a heavy chain gene has 50 V segments, 25 D segments, and 6...