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Questions in biology

📝 Answered - Antibodies are: A. immune cells that mature in the spleen and produce antibodies B. immune cells that mature in the thymus and activate other T-cells C. large cells that patrol the bloodstream or body cavities and destroy common, everyday bacteria D. white blood cells when released into the blood stream will migrate to other regions to mature and develop specific functions as part of the immune system E. B-cells produce these 'special weapons' to specifically identify (or tag) organisms

📝 Answered - What is the frequency range where the man’s hearing is seriously damaged? Take one Box 250 Hz to 500 Hz 500 Hz to 2000 Hz 250 Hz to 2000 to 2000 Hz to 8000 Hz?

📝 Answered - A sense of being overwhelmed by perceived obligations to stay connected online is: A. technostress B. distress C. chronic stress D. acute stress

📝 Answered - For each offspring genotype in the Punnett square you just completed, determine the phenotype. In other words, what is the predicted fur color and eye color of the offspring? Using your Punnett square from the last step, fill in the predicted fraction for each phenotype in the data table below. | | Black Fur and Black Eyes | Black Fur and Red Eyes | White Fur and Black Eyes | White Fur and Red Eyes | |---|---|---|---|---| | Predicted Fraction | 9/16 | 3/16 | 3/16 | 1/16 | | Predicted Percentage | 100% | 0 | % | % | Finally, convert the predicted fractions into predicted percentages.

📝 Answered - Why are biofertilizers preferred over chemical fertilizers in sustainable farming? (1) They kill pests directly (2) They increase crop size instantly (3) They fix atmospheric nitrogen and do not degrade soil (4) They make crops mature faster

📝 Answered - Which of the following situations is most likely to cause crop failure even if fertilizers and water are adequately supplied? (1) Use of genetically modified seeds (2) Continuous cropping without fallow period (3) Use of natural manures (4) Proper seed treatment before sowing

📝 Answered - 1. The hormone that stimulates the development of the male sex organs: A) Prolactin B) Thyroxin C) Testosterone D) Aldosterone 2. An investigation was done to determine the effects of thyroxin on the body weight of rats. The average weight of 150 rats was calculated as 230 g. They were then given a daily injection of thyroxin over a period of 30 days. The average weight at the end of the 30 days was calculated as 190 g. The weight of the rats decreased because of thyroxin: A) reduces the rats' appetite B) increases the amount of time they spend actively exercising C) reduces the absorption of food from the gut D) increases the rate of respiration in the cells.

📝 Answered - 1. Name the three types of nerves and explain their functions. 2. What is a reflex action? Explain with an example. 3. How are dust particles in the air we breathe filtered in our nose? 4. Mention three ways to take care of our eyes.

📝 Answered - Which level of organization is best represented by the liver? A. tissue B. organ C. organism D. organ system

📝 Answered - If a mitochondrion ran out of molecular oxygen [tex]$\left( O _2\right)$[/tex], predict which of the following situations would occur in its electron transport chain. A. Cyt [tex]$a_3$[/tex] prosthetic groups would remain oxidized and Cyt a would have nowhere to donate electrons. B. FMN prosthetic groups would remain reduced and NADH would have nowhere to donate electrons. C. Electrons would start to flow in the opposite direction, converting water into [tex]$O _2$[/tex] and [tex]$H ^{+}$[/tex]. D. [tex]$H _2 O$[/tex] would be made instead of [tex]$O _2$[/tex] at the end of the chain. F. FADH2 would be the main electron donor to the electron transport chain instead of NADH.