BIO129 EXAM 1
Which atom would form a negatively charged Ion? a. Lithium (Li) b. Sodium (Na) c. Helium (He) d. Neon (Ne) e. Flourine (F)
Flourine (F)
A hydrogen bond would form between: a. A hydrogen atom in one molecule of water and a hydrogen atom in a neighboring molecule of water b. A hydrogen atom in one molecule of water and an oxygen atom in a neighboring molecule of water c. Between the oxygen and hydrogen atoms in a single molecule of water d. Between the 2 hydrogen atoms in a single molecule of water
A hydrogen atom in one molecule of water and an oxygen atom in a neighboring molecule of water
The human heart is an organ composed of which tissue type? a. Connective b. Muscular c. Nervous d. Epithelial e. All of the above
All of the above
Which of the following would be an example of negative feedback? a. An increase in blood sugar causing a release of insulin b. A decrease in blood sugar causing a release of glucagon c. Both A and B d. Neither A nor B
Both A and B
Type 1 diabetes often results from an autoimmune disorder, a condition where the immune system incorrectly attacks and destroys a subset of cells in the pancreas. Which cells would you expect to be destroyed in type 1 diabetes? a. Alpha b. Beta
Beta
This diagram of an atom would represent a. Lithium (Li) b. Helium (He) c. Boron (B) d. Beryllium (Be) e. Carbon (C)
Boron (Be)
Neurons, cells of the nervous system, release large molecules, known as neurotransmitters, to communicate with one another. What process would you expect a neuron to use to release neurotransmitters to the outside of the cell? a. Active transport b. Diffusion c. Facilitated transport d. Endocytosis e. Exocytosis
Exocytosis
The following shows a graph of an individual's blood sugar levels following a meal. Which process causes the blood glucose levels to decrease during the time indicated by an asterisk? a. Facilitated transport b. Diffusion c. Osmosis d. Active transport
Facilitated transport
When lithium (Li) atoms form molecules, they are most likely to participate in which type of bond(s)? a. Ionic b. Polar covalent c. Nonpolar covalent d. All of the above e. None of the above
Ionic
If you place a human cell in a(n) __________ solution there should be no net movement of water into or out of the cells. a. Hypertonic b. Isotonic c. Hypotonic d. All of the above
Isotonic
The antibiotic penicillin is a molecule that cannot enter our cells by simply diffusing across their plasma membranes. Which of the following must be TRUE of penicillin? a. It must have a charge b. It must not have a charge
It must have a charge
White blood cells defend the body against infection and disease by bringing foreign molecules and pathogens into their cells and breaking them down. What cellular organelle would you expect to be abundant in white blood cells? a. smooth endoplasmic reticulum b. rough endoplasmic reticulum c. lysosomes d. nucleus e. golgi
Lysosomes
What do type 1 and type 2 diabetes have in common? a. They both result in high levels of glucose inside cells b. They both result in low levels of glucose outside cells c. Both A and B d. Neither A nor B
Neither A or B
A molecule is least likely to contain which atom? a. Neon (Ne) b. Boron (B) c. Aluminum (Al) d. Magnessium (Mg) e. Hydrogen (H)
Neon (Ne)
You mix an unknown molecule with water and find it does not dissolve in water. Which of the following could be TRUE? a. The atoms in the molecule participate in polar covalent bonds b. The atoms in the molecule participate in ionic bonds c. The molecule is hydrophilic d. All of the above could be true e. None of the above could be true
None of the above
To maintain homeostasis, what is the bodies response to an increase in temperature? a. Producing sweat b. Shivering c. Blood vessel constriction d. All of the above
Producing sweat
Which class of macromolecule can be hydrophilic and hydrophobic? a. Carbohydrates b. Lipids c. Proteins d. All of the above e. None of the above
Proteins
The majority of the air we breathe is not oxygen, but rather nitrogen gas (N2). Nitrogen gas molecules form when 2 atoms of nitrogen (N) bond to each other. To form this molecule, the nitrogen atoms would have to participate in _________ bonds. a. Ionic b. Single covalent c. Double covalent d. Triple covalent e. Hydrogen
Triple covalent
In a molecule of water (H2O) the oxygen (O) atom: a. Takes electrons and develops a negative charge b. Gives electrons and develops a positive charge c. Unequally shares electrons and develops a partial positive charge d. Unequally shares electrons and develops a partial negative charge
Unequally shares electrons and develops a partial negative charge
Glucagon
You would expect levels of ________ to be at their highest in the blood (outside the cells) when you haven't eaten a meal in a long time. a. Glucose b. Insulin c. Glucagon d. Glycogen
