Tuesday, February 21, 2012

Botany review for second exam

1. Describe the structure of the DNA molecule
2. If the sequence of bases on one stand of the molecule is AAC TGC CCG, what is the sequence on the complementary strand?
3. During DNA replication, what enzyme breaks the hydrogen bonds between the base pairs, and what enzyme matches up nucleotides to the existing ones on the parent strand of DNA?
4. Why is this type of replication called Semi Conservative?
5. How is RNA different from DNA?
6. The production of messenger RNA from DNA is called ________, and this happens in the __________ of the cell.
7. If the DNA strand being copied had this sequence: ACT GGC ATA CTA what would the sequence of the mRNA be?
8. The function of transfer RNA is ?
9. What is the name of the enzyme that produces RNA from DNA?
10. What is an anti-codon and where is it found?
11. The protein synthesis process that occurs at the ribosome is called _____________
12. What is a stop codon?

Mitosis and Meiosis
1. If a cell has 8 chromosomes and does mitosis, how many cells will be made, and how many chromosomes will each cell have?
2. If a cell has 8 chromosomes and does meiosis to make microspore cells, how many cells will be made, and how many chromosomes will each cell have?
3. Mitosis creates cells which are ________, while meiosis makes cells which are _____.
4. What are homologous chromosomes?
5. What are sister chromatids?
6. What is crossing over, and during which process, (mitosis or meiosis) does it occur?

Plant Anatomy:
1. Pick one of the ground tissues we discussed such as parenchyma or sclerenchyma, and explain how its structure and function are related.
2. What are the two types of vascular tissue in plants, and what is the function of each?
3. How is the anatomy of a monocot root, or stem or leaf different from that of a dicot?
4. What is the role of the epidermis? In woody plants the epidermis is replaced by the _______ ?
5.What are the regions called in plants where mitosis occurs to make the plant taller?
6. What is the name of the openings in the epidermis and what is the function of these openings? 7. In a dicot leaf, why is the lower layer of mesophyll more open than the upper layer?
8. What part of the root actually absorbs the water?
9. What is the difference between spring and summer wood?
10. How are compound and simple leaves different?
11. What is the function of the following stem modifications: tuber, bulb, corm, rhizome, stolon, tendril
12. What are five modifications of stems or leaves that might be found in a plant adapted to hot dry conditions?
13. Why are some plant's leaves modified to trap insects?
14. What is the role of the endodermis in the root?
15. What is the function of the pericycle?

Monday, February 20, 2012

Wow! Plant blooms after 30,000 years in permafrost

Check out this link to an article about how botanists were able to create a plant from tissue found in a 30,000 year old squirrel burrow.

Monday, February 6, 2012

Bio 120 questions for review exam 1

Here are some review questions for you. Some may be similar to the daily review questions, but all will help you while you prepare for the exam.

Chapters 1 and 2
1.How is a hypothesis different from a theory?
2.What are five characteristics of living things?
3. What is a hydrogen bond, and why are these bonds important to life?
4. Oxygen has 8 electrons, with 6 in the outermost energy level. Will this atom react?
5. How are ions formed?
6. A solution with a pH of 5 is how many times more acidic than a solution with a pH of 7?
7. What determines if an atom with react with another?
8. How are polar and non polar covalent bonds different?
9. How is the polar nature of water related to:
a. its high boiling point
b. surface tension
c. the solid form being less dense than the liquid form

Chapter 3
1. What are the building blocks of carbohydrates?
2. What is the difference between a saturated and unsaturated fatty acid?
3. Why is the shape of an enzyme important to the function of the enzyme?
4. At what level of complexity do proteins usually become functional?
5. What makes up a nucleotide?
6. What bond forms between amino acids as they react to form proteins?
7. How is the function of carbohydrates different in plants and animals?
8. Which of the macromolecules we discussed stores energy in the most efficient way?
9. What is the most common steroid in the body?

Chapter 4
1. How are the mitochondria and chloroplasts similar?
2. Why do we think mitochondria and chloroplasts were once independent organisms?
3. Describe the plasma membrane. Include how a lipid membrane functions in a watery environment.
4. What role do the proteins in the plasma membrane play?
5. How are prokaryotic cells different from eukaryotics cells?
6.What can cyanobacteria do that the bacteria living in your mouth do not do?
7.How are archeae different from the bacteria living on your skin?
8.Describe briefly what organelles would be involved in making a protein and exporting it from the cell.
9.Give an example of two cell organelles working together to accomplish a task.
10.What organelle is found on the ER?
11.What is the function of lysosomes?
12.Where is the nucleolus, and what is its function?
13.What are the functions of the Golgi bodies?

Chapter 5

1. A plant cell in a hypertonic solution will under go _____________
2. An animal cell in a hypotonic solution may undergo _____________
3. A cell must maintain an imbalance of sodium ions on either side of the membrane for it to function. What process would it most likely use of the ones we discussed in class?
4. How is active transport different from diffusion and osmosis?
5. How is dialysis different from osmosis?
6. What affect would a hypertonic solution have on a cell?
7. In a hypotonic solution water would move ________ a cell.
8. If a .9% salt solution is isotonic to a red blood cell, a 2% salt solution would be _____.