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Questions in biology

[Answered] Which of the following is true regarding diffusion rates in cells? A. Surface area has no impact compared to volume on the diffusion rate. B. Surface area and volume do not affect simple diffusion. C. A small, smooth sphere has the highest rate of diffusion of all cell shapes. D. An increase in cell surface area increases the rate of diffusion.

[Answered] Why are emperor penguins considered a species? A. They can mate and produce offspring that can mate and produce offspring. B. They can mate and produce offspring that cannot mate. C. They all walk in a similar manner.

[Answered] Which area of the brain is associated with playing a key role in the formation of new memories? A. Thalamus B. The hippocampus C. Cerebellum D. Frontal lobe

[Answered] 2. Global Warming and Greenhouse Effect Answer the following questions: 1. How does the presence of greenhouse gases cause global warming? 2. Ozone is an important gas in the upper troposphere. Describe. 3. How does global warming cause an increase in the spread of diseases? 4. Which are the main greenhouse gases? What are their sources? 5. Suggest two measures to control global warming.

[Answered] (ii) Plant fibres consisting of sclerenchyma and xylem tissues contain cellulose in their cell walls. Explain how tensile strength is related to the arrangement of cellulose in plant fibres.

[Answered] Which of these common pathogens generally lives on the skin or in the nose, but can cause blood poisoning or a heart infection if it moves inside the body? Select one of the options below. A. Campylobacter B. Norovirus C. MRSA D. C. difficile

[Answered] Identify the cells whose secretion protects the lining of the gastro-intestinal tract from various enzymes? Options: - Duodenal Cells - Oxyntic cells - Goblet Cells - Chief Cells

[Answered] b. (i) What are the sources of day-old chicks for poultry farming? (ii) List four desirable qualities of hatching eggs.

[Answered] Twisted strands of protein are referred to as what in dead and dying nerve cells? A. Protein neurons B. Protein cells C. Dangles D. Tangles

[Answered] Which of these is not a type of muscle tissue? smooth cardiac skeletal nervous