Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter5: Membranes And Transport
Section: Chapter Questions
Problem 2TYK: Which of the following statements is false? Proteins in the plasma membrane can: a. transport ions....
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Concept explainers
Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
Question
Transcribed Image Text:1. The most abundant protein found in the extracellular matrix (ECM) is
A. elastin
B. keratin
C. collagen
D. myosin
2. One type of ECM component composed of both protein and carbohydrate would be
A. lectins
B. proteoglycans
17 C. integrins
D. claudins
3. Which types of cells don't have an ECM, but rather have something else instead?
A. epithelial cells
B. connective tissue cells
C. white blood cells
D. plant cells
4. Which ECM component allows for elastic recoil, almost like a rubber band? mit
A. keratin
B. recoilin
C. elastin
D. collagen
5. Which biologists conducted the experiment that showed that the R strain of bacteria could be
converted into the S strain through transformation?
A. Griffith and colleagues
B. Hershey and colleagues
C. Avery and colleagues
D. Chase and colleagues
ulA ns as beitiazacio zi smonsa sit
6. The follow up to the experiments from the previous question showed that DNA was indeed the genetic
material. How was this done?
A. Digesting the RNA from the extract of these bacteria prevented the transformation from occurring.
B. Digesting the protein from the extract of these bacteria allowed the transformation to occur.
C. Digesting the DNA from the extract of these bacteria allowed the transformation to occur.
D. Digesting the DNA from the extract of these bacteria prevented the transformation from occurring.
7. Which biologists used bacteriophage with S35 and P32 labels to show that these viruses injected their
DNA into bacteria?
A. Avery and McCleod
B. Hershey and Chase
C. Wilkins and Franklin
D. Watson and Crick
Transcribed Image Text:8. The radioactive isotopes
in that experiment.
A. proteins, carbohydrates
B. lipids, ATP
C. proteins, DNA
D. DNA, RNA
9. Why are bacteriophages a good model system for trying to determine which macromolecule is the
genetic material?
A. They are made of protein and DNA only.
B. They are made of lipids only.
C. They infect human as well as bacterial cells.
D. They are made of protein, DNA, RNA, carbohydrates, and lipids.
10. Much of our understanding of the 2nm diameter of the double helix structure of DNA came from X-ray
diffraction studies conducted by
A. Erwin Chargaff
B. Francis Crick
C. James Watson
D. Rosalind Franklin
11. What was the main finding of Chargaff's experiments?
A. DNA is a double helix.
B. Within a few percentage points, the amounts of A = T and G = C.
C. Bacteriophages infect bacteria.
D. DNA has a sugar-phosphate backbone.
12. What group of enzymes helps DNA change how coiled it is?
A. polymerases
B. primases
C. helicases
D. topoisomerases
13. What percent of a typical mammalian genome is classified as an Alu sequence?
A. 5%
B. 10%
C. 25%
D. 33%
14. Roughly how many genes are in the human mitochondrial genome?
A. 12
B. 37
C. 93
D. 124
8
8
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