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3 years ago

Which statement about the specific immune response is FALSE?

Biology

1 answer:

yan [13]3 years ago

7 0

Answer:

Explanation:We have learned in Chapter 2 that the body is defended by innate immune ... The antigen-recognition molecules of B cells are the immunoglobulins, or Ig. These ... Membrane-bound immunoglobulin on the B-cell surface serves as the cell's ... of antibody molecules allows each antibody to bind a different specific antigen, .

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Why are lipids able to function as protective barriers in cells?

Papessa [141]

The reason behind the lipids which are able to function as protective barriers in cells is that lipids do not dissolve in water.
If lipids dissolve in water, they will not be able to function as protective barriers in cells. Nucleic acids, proteins, lipids and carbohydrates are the four types of macro-molecules in the cell.

4 0

3 years ago

The aspect from which a sample is drawn is known as the

PolarNik [594]

We use samples to perform experiments. When sampling, we take test subjects from a larger group often known as "population" or at times "universe".

Sampling is a term we use to describe the process of selecting a small representitive group from a larger population. Sampling can often be divided in its simplest form into:

Random Samples
Non-Random Samples.

Which as their names imply, represent first a sample that is chosen by not specific method and whose probability is equal for the entire population, and secondly a sample chosen based on specific parameters.

Sampling can then become more complex, being divided into more complex methods such as:

Systematic sampling
Stratified sampling
Cluster sampling

etc.

The one thing all of the sampling methods have in common is the fact that they will all draw their samples from one place. This place or aspect from which samples are drawn is known as the population group or sometimes coined as the universe, to represent the group in its entirety.

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8 0

3 years ago

The concentration of cholesterol (C27H46O) in blood is approximately 5.0mM. How many grams of cholesterol are in 315mL of blood

ASHA 777 [7]

The weight of cholesterol is 0.6 g.

Here use the concept of molarity.

<h3>What is molarity?</h3>

The amount of a substance in a specific volume of solution is known as its molarity (M). The moles of a solute per liter of a solution is known as molarity.

Molarity = no. of moles/volume (in L)

<h3>Calculation:</h3>

Given,

Molarity, M = 5.0 mM = 5 × 10⁻³ M

Volume, V = 315 mL = 315 × 10⁻³ L

To calculate,

Weight of cholesterol =?

We know that,

Molecular mass of cholesterol, C₂₇H₄₆O = 386

No. of moles = weight/ molecular mass

The formula is modified as,

Molarity = weight of cholesterol/ (molecular mass) (Volume)

Put the values in the formula,

5 × 10⁻³ = weight of cholesterol/ (386) (315 × 10⁻³)

Weight of cholesterol = 5 × 10⁻³ (386) (315 × 10⁻³)

= 0.6 g

Hence, the weight of cholesterol is 0.6 g.

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1 year ago

A small, jagged particle with a density of 1.2 g/cm3 deposits on the ground before a large, round particle with a density

Nady [450]

Answer:

The answer is high density

Explanation:

4 0

2 years ago

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What is the key relation between DNA and protein? Specify in a single sentence.

zhenek [66]

DNA is made of proteins.

4 0

3 years ago