This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Silk contains many pleated sheets, which consist predominately of amino acids such as phenylalanine ... (Read 50 times)

sammy

  • Hero Member
  • *****
  • Posts: 818
on: Aug 27, 2018
Silk contains many pleated sheets, which consist predominately of amino acids such as phenylalanine and valine. Silk is more waterproof than cotton. Why?
 
  A) Pleated sheet structure of silk occurs when mostly nonpolar amino acids are grouped together.
  B) Pleated sheet structure of cotton occurs when mostly polar amino acids are grouped together.
  C) It is the secondary, tertiary and quaternary structure of silk that make it repel water.
  D) Since cotton is made from a plant, it cannot have nonpolar molecules.

Question 2

The n-type/p-type junction is like ________.
 
  A) a revolving door
  B) a one-way valve
  C) an energy escalator
  D) a receptionist


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

onowka

  • Sr. Member
  • ****
  • Posts: 353
Reply #1 on: Aug 27, 2018
Answer to Question 1

A

Answer to Question 2

B


sammy

  • Hero Member
  • *****
  • Posts: 818
Reply #2 on: Aug 27, 2018
TY


onowka

  • Sr. Member
  • ****
  • Posts: 353
Reply #3 on: Aug 27, 2018
You're welcome


« previous next »
 

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Many salmon spawning grounds, such as the Little Qualicum River in British Columbia, consist of wate Many salmon spawning grounds, such as the Little Qualicum River in British Columbia, consist of wate
Amino sugars are found in many polysaccharides Amino sugars are found in many polysaccharides
b-Oxidation pathway for polyunsaturated fatty acids b-Oxidation pathway for polyunsaturated fatty acids
The melting of glaciers and ice sheets is making an increasing contribution The melting of glaciers and ice sheets is making an increasing contribution
Fatty fish, such as salmon, are an excellent source of omega-3 fatty acids Fatty fish, such as salmon, are an excellent source of omega-3 fatty acids
Proteins and Amino Acids Proteins and Amino Acids
Video: Homologous chromosomes during prophase I - Animation

For a complete list of videos, visit our video library