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Differentiate between the tonic and phasic receptors? Which kind is likely to be a fast-adapting receptor? Which kind is likely to be a slow-adapting receptor?
Describe how the lac operon is turned off in the absence of lactose. Describe the state of the lac operon when bacteria are in media by both glucose and lactose.
In brief describe the difference between stabilizing selection, directional selection, and disruptive selection. Explain why are layers of sedimentary rocks particularly helpful for geochronology?
Try to think of original analogies for other organelles or cell structures like Golgi, lysosomes, the cell wall, cell membrane, endoplasmic reticulum, ribosome, nucleus and so forth. Comprise where
Could cell, tissue, or genetic engineering permit humans to use chloroplasts this way? Explain 1 or 2 factors which would require to be considered for chloroplasts to function in an animal or a huma
Molecular biologists want to break up the cells and extract the DNA from the nucleus where most of the cell's DNA is situated. We will use the strawberries to isolate the DNA.
Extracellular matrix simply fills the gaps between the cells in connective tissues. Describe this statement in the light of present knowledge of extracellular matrix.
The small size in living cells can best be attributed to which of the given factors: a) The small size of most molecules. b) The large number of cells which are necessary to form an organism.
Finally if our least efficient cell required increasing its feeding efficiency to match the most efficient cell what is one way it might do it? Oh - that's without really changing its volume. Be spe
During early development, a snake embryo was exposed to a toxin which interferes with normal migration and differentiation of mesoderm. Name the main structures of the integument most influenced by
Explain why could gene arrangement be detrimental to lymphocyte survival however indispensable for host integrity?
1) Most of the cells are very small. What physical and metabolic constraints limit cell size? 2) What problems would a huge cell encounter?
If two cells are 0.1um apart could they be visualized as two separate cells by a light microscope? Explain why? Why does light of a shorter wavelength raise the resolution of a microscope?
Describe the impact of mutation on somatic cells versus germ cells. Which type of mutation influences the individual and which type of mutation influences the population? Explain why?
Provide three specific illustrations of a property which was enhanced by mutation of the DsRed. These must be three different kinds of improvements and for each illustration you must refer to a diff
Bacteria are prokaryotes. Knowing this, what can you state about the relative sizes of prokaryotes and eukaryotes?
Explain and elucidate how muscle contraction works at the molecular level: Explain how do actin and myosin interact in the sarcomere to bring about muscle contraction? What roles do ATP and calcium pl
The drug taxol, extracted from the bark of yew trees, consists of the opposite effect of the drug colchicine, an alkaloid from autumn crocus.
What is the probability that an individual haploid resultant from the meiotic division will encompass a complete parental set of centromeres (that is, a set all from one parent or all from the other
We have seen how your cells are associated to those of your parents. Explain how are your cells associated to all other humans?
You started life as a single cell; keep in mind Virchow's statement that all the cells come from pre-existing cells. Where did your original Cell come from?
A woman is known to be carrying a rigorous recessive autosomal gene. This is possible to find out whether a cell or polar body is carrying the normal or disorder recessive. The detection method dest
Describe the significance of the different positions of the chromosomes at these phases of mitosis and meiosis, and what does this signify for the kind of progeny cells that result?
Given a plant species A with a diploid number of 10 and a plant species B with a diploid number 0f 18, I explain how new polyploid species C could occur in a single generation from hybridization bet
If microtubules are stabilized what will be the result on the cell shape? On the organization of the Golgi and on mitosis?