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1. Which of the following statements about nuclear transport is true? a. mRNAs and proteins transit the nucleus through different types of nuclear pores. b. "Nuclear import receptors bind to proteins in the cytosol and bring the proteins to the nuclear pores, where the proteins are released from the nucleus." c. "Nuclear pores have water-filled pass through in a nonselective fashion." d. Nuclear pores are made up of many copies of a single protein. 2. Which of the following statements is true? a. "DNA molecules, like proteins, consist of a single, long polymeric chain that is assembles from small monomeric subunits." b. The polarity of a DNA strand results from the polarity of the nucleotide subunits. c. There are five different nucleotides that become incorporated into a DNA strand. d. Hydrogen bonds between each nucleotide hold individual DNA strands together. 3. What is the role of the nuclear localization sequence in a nuclear protein? a. It is bound by cytoplasmic proteins that direct the nuclear protein to the nuclear pore. b. It aids in protein unfolding so that the protein can thread through nuclear pores. c. It is a hydrophobic sequence that enables the protein to enter the nuclear membranes. d. It prevents the protein from diffusing out of the nucleus through nuclear pores. 4. How do changes in histone modifications lead to changes in chromatin structure? a. They directly lead to changes in the positions of the core histones. b. They change the affinity between the histone octamer and the DNA. c. They help recruit other proteins to the chromatin. d. They cause the histone N-terminal trails to become hyperextended.
In human gut microbiome, it is proposed that the most inner layer of bacterial cells (most close to the epithelial cells) is composed of micro-aerobes.
Assuming that all other variables remain constant, explain why light of shorter wavelength will produce a clearer image than light of longer wavelengths.
You want to introduce a human gene into a bacterial vector downstream of a bacterial promoter in hopes of producing a large amount of the human protein. Should you use the genomic DNA or the cDNA? Explain your reasoning.
The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. As a result, what must one expect to be true of such seeds.
A water molecule is held together through covalent bonds. Becauses the electrons are not shared equally, water exhibits many unique characteristics that are beneficial for life.
Explain how multiple signals may travel from the dendrites of a single neuron to the axon terminal of that same neuron.
Think about the following two unlinked genes in the poisonous plant, Jimson Weed. The dominant allele V produces violet petals while the recessive allele v produces white petals.
Mr. X, husband of Mrs. X, has just been diagnosed with benign prostatic hyperplasia (BPH). He has been set down a drug in the same category as prazosin named tamulosin
What are 3 structural adaptations of an octopus and what are 3 behavioral adaptations of an octopus?
Discuss the role of enzymes within biological systems and explain how they affect the energy requirements of a chemical reaction. Use the terms catalyst, enzymes, substrate, active site
Marco was in a car accident and lost a significant amount of blood. The doctors knew Marco had type O blood, but due to a terrible error, Marco received blood that was type A. This caused a severe immune reaction, but luckily Marco survived. Expla..
Define stable equilibrium in population genetics. Describe the kind of data that you would need to collect about a population to conclude that it is in a stable equilibrium.
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