101⟩ What do all organic compounds contain?
The key element is carbon. Organic compounds are all carbon-containing compounds.
By definition, an organic compound contains carbon.
Although H2CO3 is inorganic, an anomaly
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198 Biology Questions And Answers
102⟩ What is the control center of the cell?
The nucleus contains DNA, which contains the instructions for all the functions of the body.
103⟩ How long do flowers usually last?
Some flowers, such as Bachelors Buttons, Zinnias, Marigolds, and Petunias last pretty much from the time they start blooming until frost. Others, such as Irises, Tulips, and Daffodils bloom in the spring for a short time. Daylilies bloom in the summer. Mums bloom in the fall. Many varieties bloom longer if you pinch off the old blooms. The best way to choose flowers for the bloom-time you want is to obtain one or more seed catalogs or a book of flowers that gives information on each one.
104⟩ What is an example of an ion of biological importance?
Sodium in one, but so are potassium and calcium.
105⟩ What are some common laboratory techniques?
During the course of these laboratory sessions, you will be expected to become proficient in the performance of the following laboratory techniques:
1) Isolation of pure bacterial colonies
2) Gram stain
Development of competency in these techniques requires that you also know how to:
1) Flame a loop
2) Streak a plate for isolated colonies
3) Use a light microscope.
Each person is responsible for his microscope and is expected to clean the oil immersion lens at the end of each lab in which it is used. First-year students share these microscopes and, as you may remember, do not appreciate having to clean the microscope before it can be used.
106⟩ What is a test tube and how is it used?
A test tube is a clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation.
Test tubes are generally used for combining or collecting chemicals. They are used in a vast range of experiments though in big industry it is boiling tubes, which are more commonly used.
Test tubes have been notably used, of course, in the production of the world's first IVF baby. In Vitro Fertilization literally means 'in glass' fertilization.
107⟩ How are human voices created?
Human voice is created with the help of muscles in the neck and the vocal cords. The tighter the vocal cords the higher the pitch of voice. This is partly also contributed to by testosterone in males that may explain why the voice of males is lower to women.
108⟩ What do the major organs of the digestive system do?
They are salivary glands, teeth, tongue, gums, esophagus, stomach, small intestine, large intestine, pancreas, liver, and gallbladder. They breakdown food so it can be absorbed by the cells of the body. What cannot be digested is eliminated as waste.
109⟩ What is the difference between living and non-living things?
Living things obtain and use energy. They also grow throughout their lifetime. Living this is made of cells. Living things reproduce. Finally, living things move.
110⟩ What is the function of a control group in an experiment?
The function of a control group in an experiment is to be a constant to account for any effects a given environment has on variables in your experimental group. The control group isolates any uncontrollable phenomena by not being subjected to the unknown variable being tested. The most powerful experiments have two types of control groups a positive and negative control group. A positive control group is subjected to conditions, which are known to produce a positive result to show your experiment is working as expected. A negative control group is subjected to conditions where a negative result is expected. Both of these controls can then be compared to your experimental group to quantify the effect your unknown variable has relative to your controls.
111⟩ What does genetics have to do with biology?
Genetics is the study of the genes found in genetic material (ex. DNA). DNA is found in the nucleus of your cells. The most important aspect of biology is the study of cells. Therefore, genetics is just a subset of biology.
112⟩ What is a distilling flask and how is it used?
A distilling flask is a round bottom flask that often has two openings, and some of them have a long neck.
113⟩ What is telophase?
Telophase is the cell splits apart and screws itself.
114⟩ What is protein?
1) Protein is a source of backup energy that your body stores, a large complex molecule made up of one or more chains of amino acids. Proteins perform a wide variety of activities in the cell.
Highly complex nitrogenous compounds found in all animal and vegetable tissues. Proteins, the principal constituents of the protoplasm of all cells (apart from water), are of high molecular weight and consist essentially of combinations of amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins and each protein has a unique, genetically defined amino acid sequence that determines its specific shape and function.
115⟩ What is Concentration Gradient?
The graduated difference in concentration of a solute per unit - distance through a solution.
116⟩ The cytoskeleton of a cell is made of
1. microtubules, lignin, and microfilaments
2. microtubules, intermediate filaments, and microfilaments
3. microtubules, flagellin, and microfilaments
4. pectins, intermediate filaments, and microfilaments
Answer: B
117⟩ From where does the cell get oxaloacetic acid for krebs citric acid cycle?
Oxaloacetic acid is also produced when pyruvate is acted upon by pyruvate carboxylase in response to an excess of acetyl-CoA.
118⟩ Proteins made up of two or more polypeptide chains are said to possess
1. a resistance to denaturation
2. a quaternary structure
3. a tertiary structure
4. an enzymatic refractory period
Answer: B
119⟩ Which of the following is NOT true of the Calvin-Benson Cycle
1. it is also sometimes called the dark reactions of photosynthesis
2. it is also sometimes called the light independent reactions of photosynthesis
3. it converts energy trapped in the light reactions into sugar
4. it does not require stores of potential energy
Answer: D
120⟩ Barbara McClintock is famous for discovering which of the following
1. the structure of DNA with Watson and Crick
2. introns
3. jumping genes
4. exons
Answer: C
