Q: Which equation best represents the process of ATP hydrolysis in muscle contraction?

$$\mathrm{ATP} + \mathrm{H_2O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following best describes the difference between negative and positive feedback in homeostasis?

Accepted Answer

Negative feedback opposes the original stimulus to maintain stability, while positive feedback amplifies the stimulus, often leading to a specific event.

Question 2

A patient is experiencing muscle weakness due to a lack of ATP production. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondrion

Question 3

Which of the following bonds is formed by the sharing of electrons between two nonmetals and is generally the strongest?

Accepted Answer

Covalent bond

Question 4

Which equation correctly represents the dissociation of a strong acid in water?

Accepted Answer

$$\mathrm{HCl} \rightarrow \mathrm{H^+} + \mathrm{Cl^-}$$

Question 5

Which of the following best explains why phospholipids spontaneously form bilayers in water?

Accepted Answer

The hydrophilic heads interact with water while the hydrophobic tails avoid water, leading to bilayer formation.

Question 6

A cell is placed in a solution and water moves into the cell, causing it to swell. What type of solution is the cell in?

Accepted Answer

Hypotonic

Question 7

Which of the following is a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Protein synthesis for export or membrane insertion

Question 8

Which type of connective tissue is found in tendons and is characterized by densely packed collagen fibers arranged in parallel?

Accepted Answer

Dense regular connective tissue

Question 9

Which layer of the epidermis is responsible for cell division and regeneration?

Accepted Answer

Stratum basale

Question 10

Which equation best represents the process of ATP hydrolysis in muscle contraction?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 11

Which of the following best describes the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It binds to receptors on the muscle cell membrane, triggering an action potential that leads to contraction.

Question 12

Which of the following is true regarding the sodium-potassium pump in neurons?

Accepted Answer

It moves 3 Na$$^+$$ ions out and 2 K$$^+$$ ions in per ATP hydrolyzed.

Question 13

Which of the following best explains why the resting membrane potential of a neuron is negative?

Accepted Answer

There are more negatively charged proteins inside the cell and the membrane is more permeable to K$$^+$$ than Na$$^+.$$

Question 14

Which of the following is a characteristic of epithelial tissue that distinguishes it from other tissue types?

Accepted Answer

It is avascular but innervated.

Question 15

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 16

Which of the following is a function of the parietal lobe of the cerebral cortex?

Accepted Answer

Sensory processing

Question 17

Which of the following best describes the difference between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy from an electrochemical gradient established by primary active transport.

Question 18

Which of the following is true about the structure of a long bone?

Accepted Answer

The diaphysis is the shaft, and the epiphyses are the ends of the bone.

Question 19

Which of the following best describes the function of Schwann cells in the peripheral nervous system?

Accepted Answer

They form myelin sheaths around axons, increasing the speed of nerve impulse conduction.

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