biology homework help

Boost your journey with 24/7 access to skilled experts, offering unmatched biology homework help

Trusted by 1.1 M+ Happy Students

4.4Trust Pilot

4.4Edu Reviewer

5App Review

4.8Student

4.2Sitejabber

Place An Orderand save time

^*Get instant homework help from top tutors—just a WhatsApp message away. 24/7 support for all your academic needs!

Recently Asked biology Questions

Expert help when you need it

Q1:1. The conducting structures are protected from collapsing during inhalation, but the alveoli are at risk of collapsing at the end of exhalation, even in the dry desert. Explain the force that could cause the wet surfaces of the alveoli to stick together, especially at the end of a long vocal outburst, like yelling or crying.See Answer
Q2:1. Despicable as his character was, it was hard not to applaud as Deakins (played by John Travolta) shut Pritchett up. Specifically, which part of Pritchett's respiratory tract did he crush?See Answer
Q3:1. What function do alveolar macrophages serve? What would happen to the respiration of an individualwho has a decreased number of alveolar macrophages due to an immune disorder?See Answer
Q4:1. Explain which measurements can be taken to assess the lung capacity of an individual. Which conclusions can be drawn from knowing the inspiratory reserve volume and the expiratory reservevolume?See Answer
Q5:1. What function do alveolar macrophages serve? What would happen to the respiration of an individualwho has a decreased number of alveolar macrophages due to an immune disorder?See Answer
Q6:C. Prokaryotic Cells: Use a toothpick to drop some yogurt onto a microscope slide. Cover the sample with a coverslip and observe right away before the yogurt dries out. Two of the main bacterial types used in making yogurt are Streptococcus thermophilus (chains of spheres) and Lactobacillus bulgaricus (rod- shaped). The bacteria are barely visible using the 40X objective, and most of what you will see on the slide are clumps of casein (milk protein). Starting with the lowest power objective, focus on the casein clumps, then switch to the next highest power objective, and refocus. When you get to 400X total magnification, look for an open space between two thick areas of casein, and look for the tiny bacteria streaming through this space. You might notice the bacteria vibrating a bit as well. It may help to decrease your microscope illumination slightly to see these cells.See Answer
Q7:Assignment: Darwin's Finches Video 1. Give 2 examples of different finch beach shapes and explain how that shape fulfills the function:See Answer
Q8:2. How does the genetic evidence back up the story of the evolution of the finches?See Answer
Q9:3. Why was studying finches on the small island of Daphne Major a great advantage for the researchers?See Answer
Q10:4. How did the habitat on Daphne Major change with the drought conditions? What about when there was a strong El Niño and then another drought?See Answer
Q11:Question 1 (5 points) Enzymes can be inhibited in different ways. Describe two methods of enzyme inhibition by describing similarities and differences. [T/I] BI UV A Paragraph 1.See Answer
Q12:How does cancer develop? For normal cells, the rate of cell division is carefully regulated so just enough cells are produced to replace damaged cells and to provide cells needed for normal growth. Cancer begins when some cells escape from the normal controls on cell division, so too many cells are produced. To learn more about how cancers develop, read "Understanding Cancer", available at https://www.cancer.gov/about-cancer/understanding/what-is-cancer or the associated student handout available on Canvas (recommended). 1. In situ or benign tumors can usually be treated successfully by surgical removal. In contrast, cancers (i.e., tumors which have become malignant) are much more dangerous and harder to treat. Explain why. (5 pts)See Answer
Q13:2. Give an example of how exposure to carcinogenic chemicals cause mutations increase the risk of developing cancer? (5 pts)See Answer
Q14:Genes and Mutations that Contribute to the Development of Cancer Proto-oncogenes code for proteins that contribute to normal stimulation of cell division needed for growth and repair. The different types of proteins are underlined in the flow chart below. Growth factors bind to growth factor receptors → activate series of signaling enzymes → activate protein transcription factors → increased transcription of genes that code for proteins that stimulate cell division → increased cell division = cell proliferation Growth factor Receptor- Cell nucleus Normal Growth-Control Pathway Signaling enzymes Transcription factors DNA Cell proliferation (Figure from http://www.ncbi.nlm.nih.gov/books/NBK20362) An oncogene is a mutated proto-oncogene which codes for an abnormal protein that stimulates excessive cell division and thus can contribute to the formation of a tumor. One type of tumor suppressor gene codes for proteins that inhibit cell division, e.g., by interfering with one of the proteins that stimulate cell division. If both copies of a tumor suppressor gene are mutated and code for inactive proteins, this eliminates one of the inhibitory controls on cell division, which can result in excessive cell division and the formation of a tumor./nThe development of an invasive or malignant cancer typically requires the accumulation of at least five mutations in the same cell line, including: mutations of proto-oncogenes to oncogenes mutations of tumor suppressor genes so they code for inactive proteins other types of mutations that contribute to the varied abnormal characteristics of cancer cells./n3. Why do all of us need to have proto-oncogenes in the DNA of our cells? What would go wrong if our cells had mutated proto-oncogenes that coded for inactive proteins? (5 pts)See Answer
Q15:4. Match each type of gene in the first list with the type of mutation that would contribute to the development of cancer in the second list. (5 pts) a. Both copies of the gene are mutated so they code for inactive protein. b. The mutated gene codes for a protein that is more active than normal. Proto-oncogene Tumor suppressor gene Explain your reasoning with Clarity, Accuracy and Precision.See Answer
Q16:5. Some genes code for proteins that help to repair DNA when it has been damaged. Mutations to these genes can result in decreased effectiveness of DNA repair. Explain how reduced effectiveness of DNA repair can contribute to the development of cancer. (5 pts)See Answer
Q17:Data Analysis for Different Types of Cancer Different types of cancer all develop through the same basic biological processes. However, there are important differences between the types of cancer that develop in different parts of the body. For example: • The characteristics that increase the risk of cancer differ for different types of cancer. • Different types of cancer have a different prognosis (measured as the proportion of patients still alive five years after diagnosis). Type of Cancer Lung Breast Melanoma* A Characteristic or Behavior that Increases the risk of This Type of Cancer Smoking Inherited mutations in BRCA1 and BRCA2 genes Sunburns; high sun exposure during recreation and vacations *Melanom a is the most dangerous type of skin cancer. Prognosis (Five-year survival) 16% 86% 91% Cigarette smoke contains multiple cancer-causing chemicals which smokers typically inhale into their lungs. A pack-a-day smoker has about 10 times greater risk of lung cancer than a person who has never smoked. Cigarette smoking accounts for more than 80% of cases of lung cancer. BRCA1 and BRCA2 genes contribute to DNA repair, and inherited mutations in these genes account for roughly 5% of breast cancers. The UV radiation in sunlight can damage the DNA in skin cells. 6. Identify three (3) behaviors as a teenager that increase the likelihood of developing lung cancer decades later as a middle-aged adult. Then identify three (2) behaviors as a teenager that increase the likelihood of developing melanoma decades later as a middle-aged adult. (5 pt)See Answer
Q18:A study of breast cancer in a large sample of female twins found the following results. Type of twin Identical or monozygotic (have identical inherited genes) Fraternal or dizygotic (only about half their inherited genes are the same) For twins where at least one twin had breast cancer, % where the other twin % where both twins had breast cancer did not have breast cancer 80% 20% 12% 88% 7. Based on these data, which of the following statements is true? (5 pts) Explain your logical reasoning for each statement. a. Inherited genes are the main cause of breast cancer. b. Inherited genes contribute to the risk of breast cancer, but they are not the main cause. c. Inherited genes have no effect on the risk of breast cancer.See Answer
Q19:BONUS (2.5 pts) Explain the following statement in your own words: Cancer is always a genetic disease, but cancer is usually not inherited.See Answer
Q20:2. ACCURACY: Is that really true? How could we check that? How could we verify if that is true? A statement can be clear but not accurate, as in "Most dogs are over 300 pounds in weight." 3. PRECISION: Could you give more details? Could you be more specific? Could you be more exact. A statement can be both clear and accurate, but not precise, as in "Jack is overweight." (We don't know how overweight Jack is, one pound or 500 pounds.) Any answers not representing original work will result in a grade of "0" on this whole assignment! How does cancer develop? For normal cells, the rate of cell division is carefully regulated so just enough cells are produced to replace damaged cells and to provide cells needed for normal growth. Cancer begins when some cells escape from the normal controls on cell division, so too many cells are produced. To learn more about how cancers develop. read "Understanding Cancer", available at https://www.cancer.gov/about-cancer/understanding/what-is-cancer or the associated student handout available on Canvas (recommended). 1. In situ or benign tumors can usually be treated successfully by surgical removal. In contrast, cancers (i.e., tumors which have become malignant) are much more dangerous and harder to treat. Explain why. (5 pts)See Answer

TutorBin Testimonials

I found TutorBin Biology homework help when I was struggling with complex concepts. Experts provided step-wise explanations and examples to help me understand concepts clearly.

Rick Jordon

TutorBin experts resolve your doubts without making you wait for long. Their experts are responsive & available 24/7 whenever you need Biology subject guidance.

Andrea Jacobs

I trust TutorBin for assisting me in completing Biology assignments with quality and 100% accuracy. Experts are polite, listen to my problems, and have extensive experience in their domain.

Lilian King

I got my Biology homework done on time. My assignment is proofread and edited by professionals. Got zero plagiarism as experts developed my assignment from scratch. Feel relieved and super excited.

Joey Dip

Popular Subjects for biology

You can get the best rated step-by-step problem explanations from 65000+ expert tutors by ordering TutorBin biology homework help.

TutorBin helping students around the globe

TutorBin believes that distance should never be a barrier to learning. Over 500000+ orders and 100000+ happy customers explain TutorBin has become the name that keeps learning fun in the UK, USA, Canada, Australia, Singapore, and UAE.