1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nastasia [14]
3 years ago
12

serves as a selective barrier for the cell, meaning that it allows some things to pass into or out of the cell but not others.

Biology
1 answer:
Aleks04 [339]3 years ago
5 0
Cell Membrane is a selective barrier.
You might be interested in
Which of the following are the two primary gasses found in the Earth's atmosphere?
djverab [1.8K]
The answer is C took the test
8 0
3 years ago
Read 2 more answers
PLEASE HELP THANKS:))))
Komok [63]

Answer:

C. It increases for a while and then decreases.

Explanation:

7 0
3 years ago
Read 2 more answers
Is it A, B, C, or D<br> Please and thank you
Montano1993 [528]
A it needs to be warm ocean water
5 0
3 years ago
Read 2 more answers
A pathogen that has its own DNA, but relies on other organisms to replicate that DNA
tresset_1 [31]

Answer:

I’m pretty sure that it is viruses!

Explanation:

7 0
3 years ago
Theoretically, a protein could assume a virtually infinite number of configurations and conformations. Which of the following fe
Elenna [48]

Answer:

A. Only L-amino acids (except for glycine) are used in proteins.

B. The partial double bond character of the α-C-N bond in the peptide group limits the conformations of the peptide group.

C. Hydrogen bonding within elements of secondary structure stabilize certain atomic geometries.

D. Although any one of 20 amino acids is possible at each position, only one is used.

 

Explanation:

Proteins are biomolecules composed of one or more chains of amino acid residues which are joined together by peptide bonds (this sequence represents the primary structure of the protein). Proteins are made up of 20 types of amino acids which have diverse properties. The secondary structure of a protein refers to the local structure of the protein backbone, which is stabilized by hydrogen bonding between amino groups (​—NH2) and carboxyl groups (—COOH) in neighboring areas of the protein. The most common secondary structures in proteins include alpha helices, beta sheets, and random turns. Moreover, the tertiary structure in proteins describes the packing of these secondary structures. The peptide bond (CO–NH) is a stable covalent bond that has a rigid planar structure and acquires partial double-bond properties, thereby peptide bonds undergo very little rotation (i.e., rotation around peptide bonds is restricted). With the exception of glycine, all amino acids are stereoisomers, i.e., there exist mirror images of their structures which are labeled as L (left-handed) and D (right-handed) in order to differentiate between mirror images. All amino acids in proteins have the L-configuration.

5 0
2 years ago
Other questions:
  • Which statement best describes the difference between the sympathetic and parasympathetic nervous systems? A. The sympathetic sy
    8·2 answers
  • Are killer whales carnivores omnivores or herbivores
    14·2 answers
  • Which is NOT a volcanic hazard?
    14·1 answer
  • To control your blood cholesterol levels, the most important action you can take is to limit the amount of _______________ fat i
    8·1 answer
  • Most of the worlds deserts are located at latitudes where
    8·1 answer
  • Can you think of other examples of toxics substance, not listed in gizmo?
    13·1 answer
  • Trypanosoma most resembles which of the unicellular algae?
    15·1 answer
  • Define cell and atom.....​
    5·1 answer
  • If the dominant alleles for stem color and fasciation are commonly located on the same chromosome, how could the dominant allele
    13·1 answer
  • Which of the following is a function of the cell wall?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!