The plasma membrane is composed of phospholipids, which are free to move laterally, and is peppered with both stationary and mobile proteins. This view of the plasma membrane is known as the:
A) semipermeable membrane model. B) phospholipid bilayer model.
C) fluid-mosaic model. D) peppered membrane model.
Answer: C
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Answer the following statements true (T) or false (F)
1. Studies by Avery, MacLeod, and McCarty with different strains of bacteria and those by Hershey and Chase with T2 bacteriophage determined that proteins are highly complex molecules that form the genetic material for bacteria and viruses. 2. A strand of DNA is composed of nucleotide bases, sulfate groups, and sugars. 3. When considering the complexity of genetic material, multiple genes are found within a chromosome. 4. If there is 28% adenine, then there must be 28% cytosine for the DNA composition of a particular organism. 5. DNA is a double helix structure whose strands are held together by hydrogen bonds with A to T and C to G base pairing.
On a daily basis what percentage of the water the kidneys filter is excreted in urine?
a. 1 percent b. 10 percent c. 20 percent d. 50 percent e. 100 percent
Describe the two ways in which meiosis produces new combinations of genes. What will be an ideal response?
What is the most likely pathway taken by a newly synthesized protein that will be secreted by a cell?
A) ER ? Golgi ? nucleus B) Golgi ? ER ? lysosome C) ER ? Golgi ? vesicles that fuse with plasma membrane D) ER ? lysosomes ? vesicles that fuse with plasma membrane