BIO Exam 1 PreReview
What harvests energy from sunlight to rearrange molecules into sugar?
Chloroplasts
A college campus -- including the students, birds, trees, sidewalks, and air -- makes up one complete ____________.
Ecosystem
Which of the following is true of cellulose?
It is a primary structural component of plant cell walls
A recent commercial advertised for a wristband that claimed to restore health and balance by taking advantage of natural frequencies of your biofield. It supports its claim by showing several people first struggling to balance without the wristband and then balancing fine with the wristband. Why should you be skeptical of the claims made in this ad?
It was not a controlled experiment
water "beads up" on synthetic fabric such as polyester but binds to cotton. What is the most likely explanation for this?
Polyester is non polar, whereas cotton is polar.
A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?
The COHESION of water molecules to each other
To a large extent, a protein's function is dependent upon its shape. What determines a protein's shape?
The sequence of amino acids
Which of the following statements concerning saturated fats is true?
They are generally solid at room temperature
Which of the following is an accurate description of the plasma membrane?
Two layers of phospholipids with a number of proteins embedded within
Which of the following is a correct monomer/polymer pairing?
amino acid/protein
Which of the following represents the correct hierarchy of biological organization from large-scale to smaller scale?
biosphere, ecosystems, communities, populations, organisms
Which of the following molecules lacks amino acids?
cholesterol
The 3 in N-3 tells us that this atom _________.
has three more electrons than protons
Which of the following is the smallest carbohydrate?
lactose
Hydrophobic substances such as vegetable oil are
non polar substances that repel water molecules
Based on your knowledge of the polarity of water molecules, the solute molecule depicted in the figure is most likely
positively charged
What might happen to your red blood cells if you were suddenly unable to regulate the solute concentration of your blood and it began to rise?
your red blood cells would shrivel because water would move out of the cells via osmosis
