I need some help... this stuff totally confuses me!
5. According to the first law of thermodynamics, _______ can’t be created or destroyed.
A. sugar C. carbon
B. matter D. energy
6. Why is the rate at which mutations occur rather slow?
A. Cells monitor their DNA and correct errors they find.
B. Mutations usually occur in body cells, not in cells that become eggs and sperm.
C. Creatures with mutations are unable to reproduce.
D. Most mutations don’t affect critical protein parts.
7. The unit of measurement that scientists use to determine the diameter of an animal cell
Is the
A. millimeter. C. nanometer.
B. micrometer. D. meter.
8. Which one of the following statements accurately describes an enzyme?
A. It causes chemical reactions to occur faster.
B. It’s broken down into sugar as it performs its job.
C. It functions as a stabilizing molecule.
D. Its main job is to keep reluctant molecules separated.
9. If you were a plant that wanted to use sunlight to make glucose, which set of additional raw
Materials would you require?
A. Oxygen and carbon dioxide C. Carbon dioxide and water
B. Energy and water D. Oxygen and energy
10. When mitochondria burn sugar in the process called respiration, one of the by-products is
A. starch. C. chlorophyll.
B. ATP. D. glucose.
11. According to my hypothesis, bacteria that lived millions of years ago communicated by
Their body language. In scientific terms, the main problem with my hypothesis is that
A. it fails to explain the phrase body language.
B. it can’t be disproved.
C. it may be false.
D. if it’s proven, our knowledge of bacteria will be disproved.
12. If you were an organism, which one of the following would be your chief advantage of
Utilizing oxygen?
A. You’re able to act as a fermenter.
B. You’re able to produce the carbon dioxide needed by the body.
C. You’re able to get rid of volatile hydrogen before it does harm.
D. You’re able to produce energy in greater quantities.
13. Most of the fruits and vegetables you get from a supermarket are the product of
A. accidental mutations. C. selective bacterial intrusions.
B. gene insertion via bacteria. D. selective breeding.
14. The cells in your body are continuously disassembled and reassembled. Which one of the following kinds of body cells lasts longest—that is, turns over the least often?
A. Neurons C. Skin cells
B. Liver cells D. Intestinal cells
15. Because water has a relatively low viscosity, it will
A. become heavier as it freezes.
B. allow substances to diffuse through it.
C. have a low heat conductivity.
D. change temperature easily.
16. With respect to the four levels of comparative size presented in your text, which scale doesa typical protein fall into?
A. 1 C. 3
B. 2 D. 4
17. Genes produce instructions only for
A. regulating body processes. C. building body parts.
B. making proteins. D. creating new cells.
18. In bacteria-size mitochondria, both plant and animal cells produce _______, expelling
_______ in that process.
A. glucose, water C. ATP, water
B. glucose, oxygen D. ATP, oxygen
19. If you’re a fat molecule forming the innerlayer of a cell membrane, your head will face
Toward
A. the watery environment outside the cell.
B. the watery environment inside the cell.
C. either the inside or the outside of the cell.
D. the protein pump in the cell.
20. I invented the basics of sexual reproduction, getting around from place to place, and how
To use energy from the Sun. Who am I?
A. Bacterium C. Chain of DNA
B. Multicellular organism D. Cooperating cell community
