LSUE BIOLOGY 1001 MIDTERM
EXAM 2024-2025 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
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TESTED QUESTIONS AND SOLUTIONS
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A pH of 1 compared to a pH of 3 is:
100 times more acidic
In the equation 2H2 + O2 ---->H2O, H2 molecules are ____________ and H2O molecules are
____________. a. reactants . . . products
b. products . . . reactants
c. created . . . destroyed
d. used . . . stored
Reactants ; Products
In pepcid-ac or alka-seltzer tablets, you would expect a pH...
Higher than 7 on pH scale
Four most common elements in living oragnisms is :
C, H, O, and N
Often added to table salt...
Iodine
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
12
How do you calculate atomic mass of an atom?
1|Page
,Protons + Neutrons
What best describes the atomic number of an atom?
Atomic number is the number of protons in an atom
Tertiary structure of a polypeptide refers to it's: a. its size.
b. the presence of pleated sheets.
c. the amino acids of which it is made.
d. the overall three-dimensional structure.
Overall three-dimensional structure
Peptide Bonds...
Link amino acids
How are genes used by cells to build proteins?
The genes in DNA direct the synthesis of an RNA molecule, which is used to build a protein
How is sucrose formed?
From 2 monosaccharides through dehydration synthesis
What is dehydration synthesis?
Dehydration synthesis is the process of joining to molecules or compounds together, following the
removal of water.
Storage of carbohydrates is ________ in animals and ________ in plants.
Glycogen ; Starch
Statement that is FALSE about enzymes:
They are monomers used to build proteins
Where are structural proteins found?
Hair and tendons
Phospholipids are composed of...
One glycerol molecule linked to one phosphate group and two fatty acids
What is the general function of enzymes within a cell?
Speeds up chemical reactions
Statement regarding carbon that is FALSE?
2|Page
,Carbon has the ability to bond with up to six other atoms
Which is FALSE about monomers and polymers found in living organisms?
Monomers are joined tightly together by the process of hydrolysis
Which of the following is FALSE regarding anabolic steroids?
They promote bone growth
Which substance is a lipid?
Steroids
You want to keep a cough drop in your mouth for a long time. What should you do?
Keep cough drop whole. This maintains the largest surface-to-volume ratio and slows dissolution of the
cough drop.
The idea that living things are composed of cells and all cells come from other cells defines what? a. the
laws of inheritance.
b. organelle theory.
c. cell theory.
d. inheritance of acquired characteristics.
Cell theory
Protein synthesis requires the use of mRNA, which
is translated by the ribosomes into the amino acid sequences of proteins
A child dies following a series of chronic bacterial infections. At the autopsy, the physicians are startled
to see that the child's white blood cells are loaded with vacuoles containing intact bacteria. Which of the
following explanations could account for this finding?
A defect in the lysosomes of the white blood cells prevented the cells from destroying engulfed bacteria
Archaea are composed of ________ cells.
Prokaryotic
Which of the following statements about plant cell walls is false?
Plant cell walls protect plants by forming an impermeable layer around the cell
You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through
a microscope and see cell walls and membrane-bound organelles. You conclude correctly that the cells
are plant cells
Which of the following cells has the greatest surface-to-volume ratio?
3|Page
, Bacterium
Tay-Sachs disease
causes an accumulation of lipids in brain cells
Microfilaments differ from microtubules in that microfilaments
are mainly composed of actin, whereas microtubules are composed of tubulin
Which of the following statements about cells is true?
All cells have internal structures that move
A basal body is a. composed of nine microtubule triplets surrounding a central pair of microtubules.
b. similar in structure to centrioles.
c. composed of nine microtubule doublets surrounding a central pair of microtubules.
d. identical in structure to cilia.
e. None of the choices.
similar in structure to centrioles.
Intermediate filaments...
Surround the nucleus
It is essential for heart muscle cells to beat in a coordinated fashion. The cell junctions that would best
facilitate this are...
Gap junctions (communicating junctions)
Which of the following statements regarding cells is false?
All cells have a cell wall
Which characteristic promoted the utilization of lipids as the first cell membrane?
Self-assembly into a simple membrane
In a hypotonic solution, an animal cell will...
Lyse
Americans spend up to $100 billion annually for bottled water (41 billion gallons). The only beverages
with higher sales are carbonated soft drinks. Recent news stories have highlighted the fact that most
bottled water comes from municipal water supplies (the same source as your tap water), although it
may undergo an extra purification step called reverse osmosis. Imagine two tanks that are separated by
a membrane that's permeable to water, but not to the dissolved minerals present in the water. Tank A
contains tap water and Tank B contains the purified water. Under normal conditions, the purified water
would cross the membrane to dilute the more concentrated tap water solution. In the reverse osmosis
4|Page
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