BIO-120: General Biology I

BIO-120 General Biology I is the general biology course Southern New Hampshire University designs for students interested in the life sciences.

SNHU's catalog describes it as covering mammalian cell structure and function, cellular reproduction and physiology, and Mendelian genetics, and states that it delves deeply into transcription and translation of DNA, cell respiration and photosynthesis, including the molecular structures that make these processes possible. Lab exercises run in BIO-120L and follow the lecture topics.

BIO-120 is a gateway course: SNHU lists it, with its lab, as a prerequisite for later courses such as BIO-270 Genetics, BIO-280 The Microbial World and BIO-433 Exercise Physiology. Students find it demanding because it moves from naming structures to explaining molecular pathways, where each step depends on the one before.

What BIO-120 Covers

Key Concepts Explained

The Central Dogma

Information flows from DNA to RNA to protein. In transcription, a gene is copied into messenger RNA; in translation, ribosomes read the mRNA three bases (one codon) at a time and link the matching amino acids.

Cell Respiration in Three Stages

Glycolysis splits glucose in the cytoplasm; the citric acid (Krebs) cycle in the mitochondrial matrix releases carbon dioxide and loads electron carriers; oxidative phosphorylation on the inner membrane uses those carriers to make most of the ATP. Oxygen is the final electron acceptor, forming water.

Photosynthesis and Respiration as Partners

Photosynthesis uses carbon dioxide, water and light to make glucose and oxygen; respiration uses glucose and oxygen to release energy, carbon dioxide and water. Comparing the two equations side by side helps fix both.

Typical Assignments and How to Approach Them

Check your syllabus for the exact assessments. A general biology course typically includes:

Getting the Most from BIO-120L

The lab follows the lecture topics, so each experiment is a chance to see a concept work. When you write up a lab on enzymes, osmosis or photosynthesis, the discussion should name the lecture principle that explains your result. Markers look for that link more than for perfect data.

Keep a running record of procedures, measurements and anything that went wrong. Unexpected results are not failures: explaining a plausible reason, such as temperature drift or a timing error, shows scientific thinking.

Where Students Get Stuck

• Strand direction. Errors in 5' and 3' orientation spoil translation answers. Label every strand.
• Memorizing respiration numbers without the logic. Understand where carriers are loaded and used before learning ATP totals.
• Confusing location. Note which steps happen in the cytoplasm, mitochondrial matrix, inner membrane or chloroplast.
• Weak lab discussion. Interpret results, compare with expected outcomes and name realistic sources of error.

Study Tips for BIO-120

• Draw each pathway as a flowchart with inputs, outputs and location, then redraw it from memory.
• Keep a genetic code table handy and practice translating short sequences.
• Study for BIO-120 as the foundation for later courses: concepts you skip here return in genetics and microbiology.
• Review lab procedures before each lab and record observations immediately.

How We Help with BIO-120

Send the instructions, rubric, lab data and any feedback. A biology tutor can explain pathways and genetics step by step, work practice problems with you, review your lab report or prepare a custom answer showing a strong approach. For report structure, see our lab report guide.

GradeEssays is independent of Southern New Hampshire University. We provide tutoring, feedback and model material; you complete and submit your own work under SNHU's academic integrity policy and we never take exams for students. Orders are plagiarism-checked and refunded in full if late.