Get college assignment help at uniessay writers Which of the following statements provides the physiological basis for linking osmoregulation with excretion of nitrogenous wastes. (a) There are specific transport proteins that reabsorb ammonia and urea in most excretory systems (b) Ammonia and urea are solutes that contribute significantly to osmoregulation in most organisms (c) Ammonia and urea are released from the breakdown of amino acids in most excretory systems (d) Ammonia and urea are small molecules that are easily removed during filtation of the blood in most excretory systems
The plasma cell produces thousands of antibodies per second. What type of intracelluar structure would you expect to be be very prominent within the cell?
Assuming independent assortment for all gene pairs, what is the probability that the following parent AaBbCc will produce a gamete of ABC
calculate the surface area to volume ratio of a a cube whose sides are 100 um in length to approximate the surface area to volume ratio of the fern spore cell
Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and can therefore be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides and introduced these into the culture of dividing human cells at specific times. The research team used the setup to study the incorporation of labeled nucleotides into a culture of lymphocytes and found that the lymphocytes incorporated the labeled nucleotide at a significantly higher level after a pathogen was introduced into the culture. They concluded that
The solutions in the two arms of the U-tube shown below are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal. Initially, in terms of tonicity, the solution in side A with respect to that in side B is
which of these statements is correct?A. the endoderm becomes nervous system;B.the mesoderm becomes muscles and circulatory system;and the ectoderm becomes digestive tract.The ectoderm becomes nervous system;c.the mesoderm becomes muscles and circulatory system;and the endoderm becomes digestive tract.The mesoderm becomes nervous system;the endoderm becomes muscles and circulatory system;and the ectoderm becomes digestive tract.D.The ectoderm becomes nervous system;the endoderm becomes muscles and circulatory system;and the mesoderm becomes digestive tract.
A gene that can be masked by another gene is called
In animal cells and in the meristem cells of land plants, the nuclear envelope disintegrates during mitosis. This disintegration does not occur in the cells of most protists and fungi. According to our current knowledge of plant evolution, which group of organisms should feature mitosis most similar to that of land plants?
hydrogen peroxide(h2o2) breaks down into water and oxygen. Explain why this is a chemical reaction. waht are the rectants and the products in the reaction?
Get college assignment help at uniessay writers While on an intersession course in tropical ecology, Kris pulls a large, snakelike organism from a burrow (the class was granted a collecting permit). The 1-m-long organism has smooth skin, which appears to be segmented. It has two tiny eyes that are hard to see because they seem to be covered by skin. Kris brings it back to the lab at the field station, where it is a source of puzzlement to the class. Kris says that it is a giant oligochaete worm; Shaun suggests it is a legless amphibian; Kelly proposes it belongs to a snake species that is purely fossorial (lives in a burrow). The adaptation of snakes to their body shape has resulted in one of their lungs having become vestigial. Another adaptation (to a fossorial lifestyle) is snakes’ absence of limbs. If the “mystery organism” has also become adapted to a fossorial lifestyle, though its ancestors moved about on the surface, then which structures should one expect to find upon dissecting the organism? 1. reduced or absent pelvic and/or pectoral girdles 2. metanephridia 3. hydrostatic skeleton
List all (six) possible movements that can occur at the shoulder joint and name the prime mover(s) of each movement. Then name their antagonists.
n a fruit fly experiment, two gray-bodied fruit flies produce mostly gray-bodied offspring , but some of the offspring have black bodies. If there are 280 offspring, how many will you predict will have grey bodies and how many will have black bodies? How many of the 280 offspring do u predict will be heterozygous?
difference between protostome deutostome
Regarding prokaryotic reproduction, which statement is correct? Prokaryotes form gametes by meiosis. Prokaryotes exchange some of their genes by conjugation, the union of haploid gametes, and transduction. Prokaryotes feature the union of haploid gametes, as do eukaryotes. Mutation is a primary source of variation in prokaryote populations. Prokaryotes skip sexual life cycles because their life cycle is too short.
What is one role fo disaccharides What is one major role of polysaccharides Which polysaccharide serves this purpose in plants Which polysccharide serves this purpose in animals What is a second major role of polysaccharides
Describe the process of diffusion. Name and describe the condition that exists when the diffusion of a particular substance is complete.
Physical anthropologists locating the jaw bones of previously unknown vertebrate animal fossils are often able to assess the animal’s diet especially because of clues from which of the following?
The effects of pH and temperature were studied for an enzyme-catalyzed reaction. The following results were obtained. a. How do (1) temperature and (2) pH affect the activity of this enzyme? lii your answer, include a discussion of the relationship between the structure and the function of this enzyme, as well as a discussion of how structure and function of enzymes are affected by temperature and pH. b. Describe a controlled experiment that could have produced the data shown for either temperature or pH. Be sure to state the hypothesis that was tested here. Help is given in these areas.
Need key to assignment so I can make sure the answers are right because it is a review for my AP Bio test.
The process of osmoregulation is used to control the solute concentration and water balance of fluids which bathe the body cells (eg. interstitial fluid). Considering the basic model for excretion in animals, which of the following processes does not contribute to osmoregulation? (a) facilitated diffusion of ions (b) active transport of ions (c) production of water by respiration (d) osmosis
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