BIO 141 Exam 3
Put following events of elongation in prokaryotic translation in chronological order
1. Binding of mRNA with small ribosomal subunit 2. Recognition of initiation codon 3. Complementary base pairing between initiator codon and anticodon of initiator tRNA 4. Attachment of the large subunit 5. Base pairing of the mRNA codon following the initiator codon with its complementary tRNA
Hawkweed is a type of sunflower with a diploid number of 8 (2n=8). In the absence of crossing over, how many different combinations of maternal and paternal chromosomes can be packaged in hawkweed gametes?
16
The nucleotide shown above is cordycepin triphosphate. When added to cell extracts, it can be incorporated into a nucleic acid, Based on the chemical structure and your knowledge of cellular processes, where would you expect to find cordycepin incorporated?
3' end of RNA
A diploid cell has 24 chromosomes. How many DNA double helices would be present at the beginning of mitosis?
48
The coding portion of the Grit gene is 1500 nucleotides, including the stop codon. How many amino acids are in the Retriever protein?
499
Which of the following represents a silent mutation?
AGA to CGU. Codons are same
Accuracy in the translation of mRNA into the primary structure of a polypeptide depends on specificity in the...
Binding of the anticodon to the codon AND attachment of amino acids to tRNAs by aminoacyl tRNA synthetases
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?
DNA contains phosphorus, whereas protein does not
Which amino acid would you expect a tRNA with the anticodon 5'-AAG-3' to carry?
Leucine
In the process of transcription
RNA is synthesized
What happens to mRNA after the termination of translation?
The mRNA remains in the cytosol and may be translated again
Which of the following would you expect of a eukaryote lacking telomerase?
a reduction in chromosome length in gametes
The MPF protein complex turns itself off by
activating a process that destroys cyclin components
Homologous chromosomes
carry information for the same traits
The "one-gene, one-enzyme" hypothesis states that
each gene contains the information necessary to make one enzyme
If meiosis produces haploid cells, how is the diploid number restored for those organisms that spend most of their life cycle in the diploid state?
fertilization
If a base-pair change occurs during DNA replication, this
is a mutation
Sister chromatids separate from each other during
mitosis and meiosis II
Aflatoxin is a compound produced by some types of mold that can cause DNA damage. It chemically modifies DNA, distorting the DNA helix. What cellular mechanism would you expect to be involved in fixing DNA damaged by aflatoxin?
nucleotide excision repair
If a cell has accumulated DNA damage, it is unlikely to
pass the G2 checkpoint
The bacterium Bacillus anthacis, known as anthrax, causes an often fatal disease called anthrax. The antibiotic ciprofloxacin a DNA synthesis inhibitor is used to treat anthrax. For ciprofloxacin to be useful with minimal side effects it must inhibit...
prokaryotic DNA synthesis proteins only
Movement of the chromosomes during anaphase would be most affected by a drug that prevents
shortening of microtubules
Which molecule or reaction supplies the energy for polymerization of nucleotides in the process of transcription?
the phosphate bonds in the nucleoside triphosphates that serve as substrates