All Categories of Degree Level Biological Sciences

Question: DNA and Manipulating Reproduction

Answer: If 100 fertilised eggs were planted in 100 females uteri at the correct time in their menstrual cycle, only 18 of these eggs would be born. At a certain point during a female’s menstrual cycle, blisters form within the uterus and mucus is then secreted. The gene that produces this mucus is MUC1 – the mucin gene. This mucus and therefore this gene, is associated with breast cancer, which ther......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Diversity in symbiotic protoctists

Answer: Protoctists are all the unicellular eukaryotes and all the multicellular eukaryotes that are neither plants, animals nor fungi (Ridge, 2001, p29). Symbiosis is a mode of life in which different organisms live in close association that may or may not be beneficial to one or both partners (GLO CD-ROM, Open University) There are two main forms of symbiosis within protoctists: mutualism and parasitis......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Discuss the adaptations of plants in a salt marsh community.

Answer: Salt marshes are inter-tidal ecosystems, surrounded by land and open to the sea by way of an estuary (Pomeroy & Wiegert 1981). As a result salt marshes are constrained, by silt and saline water, to the type of communities it can sustain (Ranwell 1972). However because of the tidal nature of these ecosystems and the presence of many migratory birds we find some of the the most widley distributed pl......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Discuss the roles of the following in protein synthesis in mammalian cells:- the large and small subunits of the ribosome, mRNA, tRNA, release factors, SRP.

Answer: Genes drive metabolism, growth and differentiation in living cells. They do this by promoting the synthesis of proteins which in turn catalyse many biological reactions. Therefore the synthesis of proteins is one of the most central and basic events in the life of every cell. The process of proteins synthesis is divided into two different parts; transcription and translation. Transcription is p......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Discuss the major factors contributing to current reductions in global biodiversity.

Answer: Biodiversity is the blanket term for the natural biological wealth that underscores human life and well-being. Global biodiversity therefore covers a huge range of factors that occur on a vast spatial and temporal scale, making any assessment of biodiversity loss a complicated matter. The term biodiversity represents a complex interplay of species, genes and ecosystems, all three of which are nece......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Cellular Respiration – Fermentation of Corn and Malt Extracts

Answer: The fermentation rates of two extracts, which are ideal for fermentation, were evaluated. Six pairs of test tubes were setup (3 for malt, 3 for corn syrup) in a proper fermentation setup and the carbon dioxide amount was recorded on a 5 minute basis for 30 minutes. It was found that the greater yeast concentration yielded the greater carbon dioxide readings. The control tubes had no yeast in the t......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: DNA amplification by Polymerase chain reaction (PCR)

Answer: The amplification of a segment of DNA can be achieved using PCR resulting in multiple copies of the target sequence. This occurs in a three-stage cycle consisting of denaturation, annealing and extension from primers, the product of which increases exponentially because the number of new DNA strands is doubled in each cycle. The process is an enzymatic reaction and includes the following compone......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: We are currently living in the sixth wave of extinction. Discuss.

Answer: It is believed by the majority of scientists that we are now currently living in the sixth wave of extinction. Extinction waves have been known to occur since some 440 million years ago. Five major waves in history have been known to mankind but few are aware that we now live in the sixth. In the first wave of extinction, about 440 million years ago, twenty-five percent of all families of mar......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Most cells are very small. What physical and metabolic constraints limit cell size? What problems would an enormous cell encounter? What adaptations might help a very large cell survive?

Answer: The cell is an amazing structure. A single cell, alone, can function as a single entity: independently acquiring the nutrients it needs to survive, adapting to its environment, and eliminating the wastes it accumulates. Other cells, however, would rather be a part of a community of cells, like a tissue or higher organism. These cells often become specialized; they may specialize in motility, o......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: The effects of bacterial genetic resistance to antibiotic treatment.

Answer: Darwin\'s evolutionary hypothesis dictates the survival of the fittest. Accordingly, bacteria that overcome the onslaught of antibiotics (which can destroy them) and still replicate, provide a survival advantage for future generations of the same bacteria. However, from the human viewpoint, this genetic resistance to antibiotic treatment can be detrimental. Not only can ineffectiveness of antibi......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Previous 1 2 3 4 5 6 7 Next

New customer?

Registration is quick and easy



Welcome back