BIOLOGY HIGH SCHOOL

Which pair of atoms has the highest electronegativity difference? H – S
H – Cl
N – H
O – H
C – H

Answers

Answer 1
Answer: To find out the electronegativity of each pair, work it out by listing them.
H = 2.2
S = 2.1
N = 3.0
Cl = 3.0
O = 3.5
C = 2.5
 H – S -> 2.2 - 2.1 = 0.1
H – Cl -> 2.2 - 3.0 = -0.8
N – H -> 3.0 - 2.2 = 0.8
O – H -> 3.5 - 2.2 = 1.3
C – H-> 2.5 - 2.2 = 0.3
So, the pairs that has the highest electronegativity is H-Cl and N-H.

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COLLEGE

The native conformation of a protein is generally the conformation with lowest energy, making protein folding an energetically favorable process. Why then are chaperones and chaperonins required to facilitate this folding

Answers

Answer:

The protein folding of a polypeptide is important for the biological function of the protein.  The different types of interaction that plays an important role in protein folding are hydrophobic interaction, covalent and non covalent interaction.

The protein folding is the energetically driven process. But the effective and correct folding requires special molecules like chaperones and chaperonins. These molecule provide proper entropy, helps in the protein assembly and also degrades the misfolded protein.

COLLEGE

Which of the following functions does the myelin sheath perform for a nerve cell? a. insulation
b. nutrition
c. regeneration
d. sensory perception

Answers

Answer:

a. insulation  

Explanation:

The myelin sheath provides increased cell isolation (increased membrane resistance) because there are no membrane leakage channels in which there is myelin.

In addition to no membrane leakage channels, there is also virtually no type of membrane channel when there is myelin sheath (eg sodium and potassium pumps), which causes the cell a lower need for protein synthesis, or that is, less energy expenditure.

MIDDLE SCHOOL

AB blood type is an example of __________.

Answers

Answer: Codominance

Explanation:

Codominance is a phenomena in which both the alleles of gene are expressed in an individual, playing a dominant role in the expression of a triat. In AB blood grouping A and B both allele are dominent thus they can equally exert their impact for the expression of trait.

AB blood type is an example of codominance. It is a type of dominance where alleles of a pair are fully expressed. This would result to a product that is neither recessive not dominant and an AB blood type is a perfect example.

hope this helped

HIGH SCHOOL

Which type of epithelium is composed of multiple layers, including an apical layer containing tall, slender cells?

Answers

The question is incomplete as it does not have the options which are:

  • Simple squamous
  • Simple columnar
  • Pseudostratified squamous
  • Stratified squamous
  • Stratified columnar

Answer:

Stratified columnar

Explanation:

Epithelial tissue is the tissue formed by the cells which form a layer of cell and lines the lumen of the organ and also covers the organs. The epithelial tissue can be classified based on the number of layer and shape of the cell.

In the given question, the shape of the cell is slender and are tall therefore are called columnar. The cells form more than one layer or multiple layers therefore form stratified layers.

Therefore,  the epithelial tissue formed by these slender shaped multiple layers is known as the stratified columnar layer. The stratified columnar is present in the respiratory tract and the digestive tract.

Thus,  Stratified columnar is the correct answer.

MIDDLE SCHOOL

When you are exposed to disease causing germs which type of tissue is your first line of defense

Answers

The answer is your white blood cells
HIGH SCHOOL

Describe the effects of single and multiple stimuli on reaction times

Answers

The time period for an organism to respond to a stimulus is known as a reaction time.  

A single pulse will elicit a certain response time depending on its type or nature. Some stimuli elicit faster responses especially if it involves a reflex.

However, multiple stimuli can increase the reaction time of the subject through several biological mechanism. Each consecutive pulse will increase the amount of neurotransmitter that is released and thus the reaction times will shorten. There is however a limit in the biological system.

When a certain state is reached, higher stimulus frequencies will not elicit shorter response time. If the stimuli are applied over extended periods of time, the reaction times may in fact increase as the biological system will reach a state of fatigue and no longer be able to produce the necessary amounts of neurotransmitters to elicit a fast enough reaction. Thus, the neurotransmitters may be temporarily depleted or their production time increased.

MIDDLE SCHOOL

Which best explains heating by convection? A. Air molecules touch the warm ground,heating them up.

B. Warm air rises and takes heat with it; eventually it cools and sinks.

C. Sunlight travels through space without the aid of fluids or solids.

D. Land and ocean absorb and re-emit heat from the sun.​

Answers

First you have to ask yourself, what is convection? The definition of convection is "the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat." according to the dictionary.  So think about it. Which answer talks about sinking and rising?

If you haven't figured it out yet, it's B.

Hi there,

your answer to this is :  B)Warm air rises and takes heat with it; eventually it cools and sinks.

Heat Convection. Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises.

I hope this helps you out

you have a great Afternoon

FaithRawlins14

HIGH SCHOOL

Changes in one letter of DNA (ATCG) are called what type of mutation? a.-point mutation
b.frameshift mutation
c.translation mutation

Answers

Changes in one letter of the DNA strand is called Point mutation. This change can be reciprocated through various DNA repair mechanisms. Thus, the correct option is A.

What is Point Mutation?

A point mutation is a genetic mutation where change is observed in a single nucleotide base, a base can be inserted or deleted from a DNA strand or the RNA sequence of an organism's genome. Point mutations have major effect on the downstream protein product however, the consequences depends upon the type of mutation.

Point mutations are of different types such as Substitution, where one nucleotide is replaced by another nucleotide in the DNA strand, Insertion, where an extra nucleotide is inserted into the DNA sequence, Deletion in which a nucleotide is deleted from the sequence.

Therefore, the correct option is A.

Learn more about Point mutations here:

brainly.com/question/15870401

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Point mutation!!! hope this helps! please mark me the brainlest
HIGH SCHOOL

Which the following descriptions would be an example of exocytosis? Which the following descriptions would be an example of exocytosis? A.a macrophage imbibing its surrounding tissue fluid and nutrients cholines B. reabsorption by a neuron a low-density lipoprotein that becomes internalized by a hepatic cell acetylcholine released from a neuron bacteria that is engulfed by a white blood cell

Answers

Answer:

Acetylcholine released from a neuron

Explanation:

  • Exocytosis is movement of  substances out of the cells in the vesicles and Endocytosis is the intake of substances in the vesicles into cell by plasma membrane invagination.
  • Endocytosis may be either phagocytosis (engulfing the solid particles forming vesicles called phagosomes) or Pinocytosis (engulfing of liquid particles forming vesicles called as pinosomes).
  • The neurotransmitter acetyl choline is released by neuron through exocytosis on the stimulation.

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