Biochemistry

Sally Student does not understand the differences between ions, isotopes, and fr

Sally Student does not understand the differences between ions, isotopes, and fr

Sally Student does not understand the differences between ions, isotopes, and free radicals. Assuming she has learned and understood some basic chemistry, what is the likely source of her confusion? Review the definitions of these terms, then make a

ppk   2085   1 Reply

star

Sydney Student is trying to memorize chemical structures of every compound his p

Sydney Student is trying to memorize chemical structures of every compound his p

Sydney Student is trying to memorize chemical structures of every compound his professor has indicated is important to the human body. Explain to him that an easier way is to memorize a few rules of chemical bonding and then figure out the structure

ppk   1478   1 Reply

star

Your roommate is not a science major but is interested in science and asks you t

Your roommate is not a science major but is interested in science and asks you t

Your roommate is not a science major but is interested in science and asks you to verify a rumor he has heard: it is theoretically possible for two people to walk through each other without causing harm. Confirm or refute what he has heard, and expla

ppk   1077   1 Reply

bio_man

Stanley Student is confused on the similarities and differences between proteins

Stanley Student is confused on the similarities and differences between proteins

Stanley Student is confused on the similarities and differences between proteins and nucleic acids. Assuming he has learned and understood the basic chemistry, what is the likely source of his confusion? To help him sort this out, make a table or flo

ppk   1734   1 Reply

bio_man

List and distinguish between the level(s) that produce a linear shape vs. a glob

List and distinguish between the level(s) that produce a linear shape vs. a glob

Proteins are described as having different levels of structure. List and distinguish between the level(s) that produce a linear shape vs. a globular shape, and explain why one of those levels can result in either a linear or globular shape.

ppk   761   1 Reply

bio_man

While every level of a protein’s structure is important to the function of that protein...

While every level of a protein’s structure is important to the function of that protein...

While every level of a protein’s structure is important to the function of that protein, which level of structure is most important to the function of enzymes, and why?

ppk   3232   1 Reply

bio_man

Consider the two chemical reactions.

Consider the two chemical reactions.

Consider the two chemical reactions. Identify each statement following as true or false, and clarify as needed.
   A + B ? C
   C ? A + B
A.   The enzyme catalyzing the formation of C must be different from that catalyzing the breakdown of

ppk   1111   1 Reply

duddy

IMP regulation

IMP regulation

What is the first "committed" step in the biosynthetic sequence that leads to IMP? How is this step regulated?

allan2009   1326   1 Reply

bio_man

Metabolic pathways citric acid cycle

Metabolic pathways citric acid cycle

- Decribe the steps in the metabolic pathway in which cells oxidise a four-carbon, striaght-chain saturated fatty acid (butyrate: 4:0) to the fragments that enter the citric acid cycle.
- In what way would you change or add to your answer if the

allan2009   1834   1 Reply

bio_man

The fight-or-flight response prepares an animal to respond to a threatening situ

The fight-or-flight response prepares an animal to respond to a threatening situ

The fight-or-flight response prepares an animal to respond to a threatening situation, by either fighting or running away. One aspect of this response is changes in blood flow such that the skeletal muscles and heart receive higher blood flow (vessel

ppk   1751   1 Reply

bio_man

Explain the difference between negative feedback and positive feedback, providin

Explain the difference between negative feedback and positive feedback, providin

Explain the difference between negative feedback and positive feedback, providing an example of each. What does the term negative tell you about the result of the feedback? Why is negative feedback so much more common in physiology than positive feed

ppk   6034   1 Reply

bio_man

Briefly explain the effects of the hormone insulin on glucose transport. What is

Briefly explain the effects of the hormone insulin on glucose transport. What is

Briefly explain the effects of the hormone insulin on glucose transport. What is diabetes mellitus? How are Types I and II different? Why do insulin injections help alleviate one type but not the other?

ppk   1645   1 Reply

chemb

Describe the signal molecule derivatives of arachidonic acid.

Describe the signal molecule derivatives of arachidonic acid.

Describe the signal molecule derivatives of arachidonic acid.

ppk   897   1 Reply

chemb

Dexamethasone is a drug used to suppress the secretion of ACTH from the anterior

Dexamethasone is a drug used to suppress the secretion of ACTH from the anterior

Dexamethasone is a drug used to suppress the secretion of ACTH from the anterior pituitary gland. Two patients with hypersecretion of cortisol are given dexamethasone. Anika's cortisol secretion level falls to normal after the medication, but Bo

ppk   5231   1 Reply

chemb

One hypothalamic hormone triggers a pituitary hormone to cause release of an adr

One hypothalamic hormone triggers a pituitary hormone to cause release of an adr

One hypothalamic hormone triggers a pituitary hormone to cause release of an adrenal hormone. Fill in the names of the hormones below. If a tumor in the adrenal cortex resulted in hypercortisolism, how would this affect the relative levels of hormone

ppk   2191   1 Reply

chemb

Explain the concept of evolutionary conservation of hormone activity, and how re

Explain the concept of evolutionary conservation of hormone activity, and how re

Explain the concept of evolutionary conservation of hormone activity, and how recognition of that phenomenon has influenced hormone therapies.

ppk   2384   1 Reply

shruti

DNS method for xylanase assay

DNS method for xylanase assay

Hi there,

Im not sure about the method and all but correct me if im wrong.

Reaction mixture of 1% xylan + citrate buffer pH 5.3 + 1 ml supernatant from enzyme extraction process is incubated for 50 Celsius for 30 min. This is to

stephie_hype   3091   1 Reply

duddy

Describe the action of aspirin and opiates in pain relief. What does your answer

Describe the action of aspirin and opiates in pain relief. What does your answer

Describe the action of aspirin and opiates in pain relief. What does your answer suggest about opiates?

ppk   2389   1 Reply

duddy

Your studies of the neuromuscular junction reveal that the excitatory neurotrans

Your studies of the neuromuscular junction reveal that the excitatory neurotrans

Your studies of the neuromuscular junction reveal that the excitatory neurotransmitter opens a channel permeable to all three cations. Calculate the equilibrium potential for each cation. In which direction will each cation move when the channel is o

ppk   937   1 Reply

bio_man

Control of the neuromuscular junction in this new invertebrate is found to invol

Control of the neuromuscular junction in this new invertebrate is found to invol

Control of the neuromuscular junction in this new invertebrate is found to involve dual innervation, where one motor neuron secretes an excitatory neurotransmitter and another secretes an inhibitory neurotransmitter onto the muscle. How does this com

ppk   985   1 Reply

duddy

Though you are an attentive parent, you lost track of your inquisitive toddler f

Though you are an attentive parent, you lost track of your inquisitive toddler f

Though you are an attentive parent, you lost track of your inquisitive toddler for a few minutes, just long enough for him to wander into the garage and open a package of insecticide that you use to control insects in your garden. You have no idea if

ppk   3932   1 Reply

lewis

Phenelzine is a common MAO inhibitor that has been used to treat depression. It

Phenelzine is a common MAO inhibitor that has been used to treat depression. It

Phenelzine is a common MAO inhibitor that has been used to treat depression. It is not, however, prescribed as often as other antidepressants due to its effects on the autonomic nervous system. Describe several side effects that may result from takin

ppk   1991   1 Reply

duddy

In a laboratory experiment, adding curare, which binds to acetylcholine receptor

In a laboratory experiment, adding curare, which binds to acetylcholine receptor

In a laboratory experiment, adding curare, which binds to acetylcholine receptors, to the solution around a muscle decreases the size of the end plate potential. Adding prostigmine, an acetylcholinesterase blocker, increases the size of the end plate

ppk   1931   1 Reply

how_mendel

At the molecular level, what are the effects of nicotine on the nervous system?

At the molecular level, what are the effects of nicotine on the nervous system?

At the molecular level, what are the effects of nicotine on the nervous system? How are these effects exerted? How are these effects similar to or different from those of curare? How do these effects explain some of the physiological consequences of

ppk   2222   1 Reply

how_mendel

To perform surgery with a minimum of pain for the patient and hassle for the sur

To perform surgery with a minimum of pain for the patient and hassle for the sur

To perform surgery with a minimum of pain for the patient and hassle for the surgeon, a patient may be administered a general anesthetic to prevent sensation and consciousness, as well as a paralytic to prevent reflexive muscle spasms. From what you

ppk   1657   1 Reply

bio_man

Compare and contrast the voltage-gated sodium and potassium channels introduced

Compare and contrast the voltage-gated sodium and potassium channels introduced

Compare and contrast the voltage-gated sodium and potassium channels introduced in Ch. 8, with the acetylcholine receptor/channel. What may be confusing to the beginning physiology student trying to understand the ion specificity of the acetylcholine

ppk   7803   1 Reply

bio_man

Describe the different types of cholinergic receptors in the nervous system. Whi

Describe the different types of cholinergic receptors in the nervous system. Whi

Describe the different types of cholinergic receptors in the nervous system. Which neurotransmitter binds to each type?

ppk   2578   1 Reply

bio_man

The interaction between Ca2+ and calmodulin in smooth muscle fibers has been des

The interaction between Ca2+ and calmodulin in smooth muscle fibers has been des

The interaction between Ca2+ and calmodulin in smooth muscle fibers has been described as a second messenger system. Develop an argument to support this position, using another second messenger system you have studied for comparison.

ppk   1169   1 Reply

duddy

Factors playing a role in fatigue can be classified into

Factors playing a role in fatigue can be classified into

Factors playing a role in fatigue can be classified into __________ and __________ mechanisms. Define each mechanism and give an example for each mechanism.

ppk   1237   1 Reply

duddy

For how long does cocaine stay in your bloodstream after you've taken it?

For how long does cocaine stay in your bloodstream after you've taken it?

I'm finding a lot of different answers to this question but don't know which are reliable and which are not so please help would be very grateful 
Thank you

dsimpson1990   1361   1 Reply

duddy

Briefly describe the following three pathways, being sure to mention the names of the critical organ

Briefly describe the following three pathways, being sure to mention the names of the critical organ

3.   Briefly describe the following three pathways, being sure to mention the names of the critical organs and structures involved
a.   Movement of oxygen and carbon dioxide between the outside air and the blood.


b.   Movement of bloo

blonde101   577   1 Reply

how_mendel

bio

bio

Please help with table attached

blonde101   693   1 Reply

how_mendel

Acid-base balance is regulated by a number of systems. Describe the sources of r

Acid-base balance is regulated by a number of systems. Describe the sources of r

Acid-base balance is regulated by a number of systems. Describe the sources of respiratory acidosis and alkalosis as well as metabolic acidosis and alkalosis.

ppk   782   1 Reply

bio_man

The balance of acid and base within the blood plays an important role in a numbe

The balance of acid and base within the blood plays an important role in a numbe

The balance of acid and base within the blood plays an important role in a number of bodily functions. How do changes in the pH of the blood affect bodily functions?

ppk   809   1 Reply

duddy

The maintenance of plasma calcium has important implications. Describe the mecha

The maintenance of plasma calcium has important implications. Describe the mecha

The maintenance of plasma calcium has important implications. Describe the mechanisms whereby plasma calcium concentrations are regulated by hormones.

ppk   728   1 Reply

duddy

The recovery of potassium from the filtrate that enters Bowman's capsule is an i

The recovery of potassium from the filtrate that enters Bowman's capsule is an i

The recovery of potassium from the filtrate that enters Bowman's capsule is an important function of the kidneys. Describe the mechanisms whereby potassium is secreted and/or reabsorbed in each segment of the kidney tubules.

ppk   1047   1 Reply

bio_man

The recovery of sodium from the filtrate that enters Bowman's capsule is an impo

The recovery of sodium from the filtrate that enters Bowman's capsule is an impo

The recovery of sodium from the filtrate that enters Bowman's capsule is an important function of the kidneys. Describe the mechanisms for sodium reabsorption in the distal tubules and collecting ducts and the hormonal mechanisms involved in its

ppk   842   1 Reply

duddy

In the lung, the uptake of oxygen is in part determined by the ventilation-perfu

In the lung, the uptake of oxygen is in part determined by the ventilation-perfu

In the lung, the uptake of oxygen is in part determined by the ventilation-perfusion ratio, which varies throughout the lung. Describe how ventilation-perfusion is regulated within the lung itself. How would ventilation-perfusion ratio be affected by

ppk   1039   1 Reply

bio_man

The central pattern generator is the rhythm generator that sets the background r

The central pattern generator is the rhythm generator that sets the background r

The central pattern generator is the rhythm generator that sets the background rhythm for ventilation. However, the respiratory system must be able to respond to changes that require either increases or decreases in ventilation. Describe the receptor

ppk   1105   1 Reply

duddy

Breathing involves the interaction between a number of the control centers of ve

Breathing involves the interaction between a number of the control centers of ve

Breathing involves the interaction between a number of the control centers of ventilation. Describe the model that has been developed to describe the process of quiet breathing, including how volume of the lung is altered by this process.

ppk   930   1 Reply

duddy