answer.
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
s2008m [1.1K]
2 years ago
12

Which class of molecules can directly cross the cell membrane without the aid of transport proteins? Choose one: A. Ions B. Suga

rs C. Uncharged gasses D. Amino acids
Biology
1 answer:
yulyashka [42]2 years ago
6 0
Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
You might be interested in
Along the East Coast of the U.S., temperatures are more extreme than along the West Coast. This is because _____. the East Coast
Aleks04 [339]

The correct answer is: "the West Coast receives it's wind and weather patterns from the ocean, while the East Coast receives them from land"

7 0
2 years ago
Read 2 more answers
Which feature is found most often in prokaryotic cells?
viva [34]
All cells share four common components:<span>a plasma membrane: an outer covering that separates the cell's interior from its surrounding environment.cytoplasm: a jelly-like cytosol within the cell in which other cellular components are found.DNA: the genetic material of the cell.<span>ribosomes: where protein synthesis occurs.</span></span>
6 0
2 years ago
Read 2 more answers
What is a cone shaped mountain that is built from layers of lava
sasho [114]
Cinder cone. <span>A </span>cinder cone<span> or scoria </span>cone<span> is a steep conical hill of loose pyroclastic fragments. It is build from the layers of lava it spews.</span>
3 0
2 years ago
Read 2 more answers
In humans, Rh-positive individuals have the Rh antigen on their red blood cells, while Rh-negative individuals do not. If the Rh
Marta_Voda [28]

Answer:

D. 0.60

Explanation:

If the population is in Hardy-Weinberg equilibrium, the genotypic frequencies are:

  • freq AA = p²
  • freq Aa = 2pq
  • freq aa = q²

<em>p</em> is the frequency of the Rh positive allele (A) and <em>q</em> is the frequency of the Rh-negative allele (a).

If 84% of the population is Rh-positive, then 16% is Rh-negative and has the genotype <em>aa</em>. Therefore:

q² = 0.16

q = √0.16

q=0.4

And because p+q=1,

p = 1 - 0.4

p = 0.6

The frequency of the Rh-positive allele is 0.6

3 0
2 years ago
What are the characteristics of a successful group discussion? Select two options. The discussion focuses on only one or two poi
UkoKoshka [18]

Answer:

The discussion allows all group members to share their points of view.

and

The discussion encourages group members with conflicting views to speak up.

Explanation:

A good discussion always clears up everyone's point of view, letting everyone voice their opinion.

8 0
2 years ago
Read 2 more answers
Other questions:
  • Why would a student who wants to be a doctor study chemistry?
    5·1 answer
  • True or false cells use the instructions in nuvleic acids to carry out all life functions
    5·1 answer
  • Arrange the symbols to form a DNA molecule.
    15·1 answer
  • Use the drop-down menus below to match the scientist(s) to their contribution to the discovery of base pairings. studied the rol
    10·2 answers
  • Put the stages of fossil fuel formation in their correct order pleaseeee.
    11·2 answers
  • g"In the β-pleated sheet secondary structure of a protein, two or more amino acid sequences in separate parts of the protein are
    9·1 answer
  • Water evaporates from a lake. Arrange the next steps of the water cycle in the correct order.
    14·2 answers
  • The diagram shows horizontal rock layers. According to the law of superposition, which statement is supported by the diagram? La
    10·2 answers
  • Explain how the sneaker resale industry is an example of capitalism at work.
    6·1 answer
  • Which type of cell adhesion is useful for anchoring cells together and defending against shear forces on tissues
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!