Hello there,Just wanted to tell you that i finished answering the questions= total number of questions 250 . I am attaching to this message a Microsoft Office ( .docx format) file entitled" Working 250 biology questions ". It contains 5 parts and the correct answer is highlighted in yellow . Please check to make sure all questions are answered ( did that by myself , but just in case i missed anything) . There were only 2 questions out of all 250 which are discussable , and they are colored in orange and have a red text under them with the information and why it might be confusing answering to them .I am also attaching it here too:Practice 1 : Question 2 Practice 2 : Question 42 ( i think there is a grammar mistake + naval=nasal )--------If you have any questions or you are not sure about any of my answers , don't hesitate to text me back and i will look into it once more and get some references if needed.
Biology Practice Questions
1. The basic unit of life is the ___.
2. The most basic level of organization is the ___.
Check this with your material in order to ensure that this is the correct answer. The following is the list of
the level of organization : atom, molecule, organelle, cell , tissue , organ,organ
system,organism,population,community,ecosystem,biosphere. In biology, cell represents the most basic
level of organization because cell represents the small unit that is considered as a living being. Even so , if
we include lifeless elements too , atoms are the most basic level of organization as there is nothing
smaller than atoms.
3. A systematic way of obtaining knowledge about the natural world is ____.
B. An hypothesis
C. An experiment
D. The variable
E. A prediction
4. The first step of the scientific method is to ____.
A. Perform an experiment
B. Make a prediction
C. Test a prediction
D. Analyze data
E. Observation of a natural event
5. The statement “animals that live in the desert will produce concentrated urine” is ___.
A. An opinion
B. A hypothesis
D. A variable
E. A control group
6. Which of these is designed by researchers to test only a single prediction of a hypothesis
at a time?
A. Controlled experiment
B. Experimental Variable
C. Control Group
D. Controlled variable
E. Experimental Constant
7. The control in an experiment ____.
A. Makes the experiment invalid
B. Is an additional replicate for statistical purposes
C. Reduces experimental errors
D. Minimizes experimental inaccuracy
E. Allows a standard of comparison for the experimental group
8. Science is based on ___.
9. In science, the word “theory” ____.
A. Is an explanation that has not been published
B. Has essentially the same meaning as a prediction
C. Is based mostly on opinions
D. Signifies that a hypothesis has been tested and proven over a period of time
E. Means that a scientist has a hunch something is true
10. After many years of testing, an hypothesis becomes accepted as a ____.
11. A pure substance that cannot be broken down into another substance is known as a(n)
12. The atomic number denotes the number of ___ in an atom of a particular element.
C. Energy Levels
13. Covalent bonds ___.
A. Occur when ions of opposite charge are attracted to each other
B. Occur during oxidation reactions
C. Are the weak link between two water molecules
D. Are extremely strong and stable
E. Form bonds that hold Na and Cl together in NaCl (table salt)
14. Which type of bond is responsible for the linking together of two water molecules?
C. Polar Covalent
D. Non-polar Covalent
15. An atom carries no charge because it has asa many electrons as ___.
16. How do hydrophilic molecules interact with water?
A. They are attracted to water
B. They are absorbed by water
C. They are repelled by water
D. They absorb heat from water
E. They transfer heat to water
17. A dissolved substance in water is a(n) ____.
D. Free radical
18. A solution with a pH of 7.4 ____
A. Is considered an acid
B. Has more H+ than OHC. Has equal numbers of H+ and OHD. Has a pH similar to ammonia
E. Is similar in acidity to normal body fluids
19. A system that compensates for pH fluctuations by donating or accepting H+ is known
as a(n) ____.
20. The structural building blocks for proteins are ____.
B. Amino acids
21. Every living organism must have ____.
A. At least one cell
B. A nucleus
C. A cell wall
22. A prokaryotic cell has all of the following EXCEPT ____.
A. A plasma membrane
D. A nucleus inside a membrane
23. The term eukaryotic means ____.
A. Having many nuclei
B. Before the nucleus
C. Having a true nucleus
D. Not having a nucleus
E. Not having DNA
24. What organelle is the sit of ATP production?
E. Golgi body
25. What portion of the cell contains mitochondria and microfilaments?
D. Smooth ER
E. Rough ER
26. What component of the cell is the site of polypeptide (protein) assembly?
27. In what portion of a eukaryotic cell is the majority of DNA isolated?
28. Which particle is able to freely cross the plasma membrane?
B. ClC. Oxygen
E. Amino Acids
29. DNA and its attached proteins are known as ____.
B. The nuclear envelope
30. A nuclear envelope has four of the following characteristics, Which is the exception?
A. A single lipid bilayer
B. Continuous with endoplasmic reticulum
C. Possesses pores
D. Controls passage of substances into and out of nucleus
E. Separates DNA from cytoplasm
31. The major difference between the smooth and rough ER is that ____.
A. Smooth ER is isolated to the nucleus
B. Vesicles are found only in the smooth ER
C. Rough ER contains ribosomes
D. Smooth ER is the site of polypeptide synthesis
E. Rough ER is the site of lipid synthesis
32. Which tissue type below consists of several layers of cells?
A. Simple squamous
B. Simple cubektal
C. Simple Columnar
D. Stratified squamous
33. Scientists believe that mitochondria may have evolved from bacteria because ____.
A. They both have cristae membranes
B. Mitochondria have their own DNA
C. Their shapes and sizes are exactly the same
D. Both are surrounded by a cell wall
E. Both can live independently
34. The diffusion of water across a membrane is known as ____.
B. Active transport
C. Facilitated Diffusion
D. Movement through a channel
E. Carrier mediated transport
35. The measure of concentration of solutes in a solution is ____.
C. Hydrostatic pressure
E. Facilitated diffusion
36. A cell moves sodium ions against its concentration gradient. This is an example of ____
A. Active transport
D. Facilitated Diffusion
e. Diffusion through a channel
37. All enzymes are which type of organic molecule?
38. What molecule is the body’s main energy source?
B. Carbon dioxide...