30) In adults, the function of the yellow marrow is to:
A) store adipose tissue
B) form blood cells
C) store calcium and phosphorus
D) cause lengthwise growth in long bones
E) decrease friction at joint surfaces

31) The presence of an epiphyseal plate indicates that:
A) bone is dead
B) bone length is no longer increasing
C) bone diameter is increasing
D) bone diameter is decreasing
E) bone length is increasing

32) The bone cells that respond to parathyroid hormone (PTH) to destroy bone matrix and release calcium into the blood are called:
A) osteocytes
B) chondrocytes
C) erythrocytes
D) osteoclasts
E) osteoblasts

33) A round or oval opening through a bone is a:
A) facet
B) fossa
C) foramen
D) fissure
E) trochanter

34) Which of the following bones is NOT considered part of the appendicular skeleton:
A) femur
B) sternum
C) radius
D) metatarsals
E) scapula

35) What kind of tissue is the forerunner of long bones in the embryo:
A) elastic connective tissue
B) dense fibrous connective tissue
C) fibrocartilage
D) hyaline cartilage
E) loose fibrous connective tissue

36) Which of the following is an example of a bone that forms from fibrous membranes:
A) the parietal bone
B) the radius
C) the humerus
D) the femur
E) the tibia

37) There are four stages in the healing of a bone fracture. Which of the following best illustrates the sequence of these stages:
1. bony callus formation 3. fibrocartilage callus formation
2. bone remodeling 4. hematoma formation
A) 4, 3, 2, 1
B) 4, 3, 1, 2
C) 1, 2, 3, 4
D) 1, 3, 4, 2
E) 1, 3, 2, 4

38) A compound fracture can be described as when:
A) the bone is crushed
B) the broken bone ends are forced into each other
C) the broken bone is exposed to the outside
D) the bone is broken into many fragments
E) adjacent bones fracture simultaneously

39) The axial skeleton contains:
1. skull
2. arms and legs
3. ribs and sternum
4. vertebrae
5. pelvic girdles
A) 1, 3, 4, 5
B) 1, 3, 4
C) 2, 5
D) 2, 3, 4, 5
E) 1, 2, 3, 5

40) The fibrous connections between the bones of a fetal skull are:
A) alveolar margins
B) sinuses
C) palate
D) crista galli
E) fontanels

41) Which of these bones is associated with the hand:
A) talus
B) calcaneus
C) metatarsals
D) tarsals
E) metacarpals

42) The hyoid bone is unique because:
A) it is the only bone of the body that does not directly articulate with any other bone
B) it has an unusual shape
C) it is covered with mucosa
D) it has no specific function
E) it largely consists of cartilage

43) How many true ribs do humans have:
A) three
B) five
C) seven
D) twelve
E) fifteen

44) The atlas is the:
A) last lumbar vertebra
B) first thoracic vertebra
C) part of the sacrum
D) second cervical vertebra
E) first cervical vertebra

45) Which is the correct order of ribs, from superior to inferior:
A) floating ribs, true ribs, false ribs
B) floating ribs, false ribs, true ribs
C) true ribs, false ribs, floating ribs
D) true ribs, floating ribs, false ribs
E) false ribs, floating ribs, true ribs

46) The sternum is the result of fusion of three bones called the:
A) ischium, ilium, coccyx
B) pubis, ischium, ilium
C) manubrium, body, xiphoid process
D) jugular notch, sternal angle, xiphisternal joint
E) true ribs, manubrium, xiphoid process


47) Which two bones constitute the forearm:
A) radius and humerus
B) humerus and scapula
C) fibula and tibia
D) ulna and radius
E) femur and fibula

48) The tailbone is the:
A) ischium
B) sacrum
C) pubis
D) coccyx
E) patella

49) Which of the following is correct of the female pelvis when comparing it with the male pelvis:
A) the angle of the female pubic arch is smaller

A tributary is a smaller stream or river that flows into a larger one, contributing to its volume and influencing its navigability, ecosystem, and flooding potential.

The definition of a tributary is a stream or river that flows into a larger stream, river, or lake. These smaller watercourses contribute to the flow of the larger one, which is often referred to as the mainstem or parent river. Tributaries do not flow directly into the sea. They provide additional water volume to their parent river, which can then affect the river's ability to navigate, its ecosystem, and potential for flooding. For example, the Missouri River is a tributary of the Mississippi River because it flows into it.

The (s)−3−iodo−2−methylnonane belongs to organic compounds and consists of a nonane with an iodine atom attached to the third carbon and a methyl group attached to the second carbon.

The structure corresponding to the name (s)−3−iodo−2−methylnonane is achieved by following the nomenclature system for organic compounds. Nonane is a carbon backbone with nine carbon atoms. The '2-methyl' indicates that there is a methyl, or CH3 group, attached to the second carbon from the end. The '3-iodo' indicates that there is an iodine atom attached to the third carbon from the end. Therefore, starting from one end of the nonane, we have CH3-CH2-CH(I)-CH(CH3)-CH2-CH2-CH2-CH2-CH3.

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The pH of a 4.5 × 10^-4 M Ba(OH)2 solution is calculated by first determining the hydroxide ion concentration, which is doubled due to the two hydroxide ions provided by Ba(OH)2, and then calculating the pOH followed by subtracting from 14 to get the pH value of approximately 10.95.

Calculating the pH of Barium Hydroxide Solution

For the calculation of the pH of a 4.5 × 10-4 M barium hydroxide (Ba(OH)2) solution, it is crucial to consider that barium hydroxide is a strong base which dissociates fully in water. As Ba(OH)2 provides two moles of hydroxide ions for each mole of the substance dissolved, the hydroxide ion concentration will be twice the concentration of Ba(OH)2, which is 9 × 10-4 M (2 × 4.5 × 10-4 M).

To find the pOH of the solution, we take the negative logarithm of the hydroxide ion concentration: pOH = -log (9 × 10-4) = 3.045757491. To find the pH, subtract the pOH from 14: pH = 14 - 3.045757491, which simplifies to approximately pH = 10.95. This is a basic solution, as expected from barium hydroxide.

In laboratory settings, remember to use proper safety precautions, the correct form of chemicals, accurate measuring tools, and the appropriate methods to adjust the pH of solutions, such as adding acid or base. Moreover, for precise results, correctly label solutions and calibrate equipment such as pH meters as necessary.

Enzymes increase the rate of a reaction by decreasing the activation energy required for the reaction but do not change the Gibbs free energy change of the reaction. Option C is correct.

Among the statements about enzymes, the true one is that enzymes increase the rate of a reaction by decreasing the activation energy of the reaction. Enzymes are biological catalysts that specifically bind to substrates and help convert them to products more efficiently by lowering the energetic barrier, which is the activation energy required for the reaction to proceed.

However, it is important to note that while enzymes do lower the activation energy, they do not alter the Gibbs free energy change (AG) of the reaction. The Gibbs free energy change is a thermodynamic property that determines the spontaneity of a reaction and remains unchanged regardless of whether enzymes are present.

Hence, C. is the correct option.

To find the least degree of precision we swould model it after the kg amount or 4.05 kg or two decimal places. So that would add 0.56795 kg (0.57 kg) and then 0.1001 kg (0.1 kg) so that our answer would be 4.72 kg.

In the other hand, the greatest degree of precision would be to conver 4.05 kg to 4050 g so that 4050g + 567.95 + 100.1 g= 4718.05 grams or 4718 g.

Gas is the state of matter that can most easily undergo changes in volume. The freely moving particles of gas adapt to take up the entire volume and shape of any container it is kept in.

The state of matter that undergoes changes in volume most easily is gas. This is because gaseous substances have the most dispersed particles among the three fundamental states of matter (solids, liquids, and gases). These particles move freely, occupying the complete shape and volume of the container in which they are kept. Thus, any change in the container's size will in-turn affect the volume of the gas. For instance, if we inflate a balloon with gas and then deflate it, the gas volume adjusts in line with the balloon's volume changes.

Learn more about State of Matter

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Answer: The number of neutrons in the given isotope are 27.

Explanation:

Atomic number is defined as the number of electrons or number of protons that are present in a neutral atom. It is represented as Z.

Z = Atomic number = Number of electrons = Number of protons

Mass number is defined as the sum of number of protons and number of neutrons present in an atom. It is represented as A.

A = Mass number = Number of protons + Number of neutrons

Number of neutrons = Mass number - Atomic number

We are given an isotope having representation:  [tex]_{20}^{47}\textrm{Ca}[/tex]

Atomic number or number of protons = 20

Mass number = 47

So, number of neutrons = 47 - 20 = 27

Hence, the number of neutrons in the given isotope are 27.

Without the total voltage or detailed circuit configuration, it's not possible to determine the current through the 30.0 ω resistor. An example using Ohm's law has been provided for a hypothetical scenario.

To find the current through the 30.0 ω resistor, we would need to apply Ohm's law, which states that I = V/R, where I is the current, V is the voltage, and R is the resistance. However, the provided information is insufficient to determine the current, as we are not given the total voltage across the resistor or the configuration of the circuit (whether it is series, parallel, or a combination).

If the 30.0 ω resistor were the only resistance in the circuit and the voltage across it was provided, we could directly use Ohm's law to calculate the current. For example, if the voltage was 10 V, the current would simply be I = 10V / 30.0ω = 0.333 A.

Without additional information, such as the configuration of the circuit and the total voltage, we cannot accurately calculate the current. The problem might be missing details or might require knowledge about the rest of the circuit to solve.

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Both a feather and an iron bar will impact the ground at the same time if released from the same height in a room without air resistance, demonstrating that gravity causes all objects to fall with the same acceleration, disregarding their mass.

If a feather and an iron bar are released from the same height in a room without any air resistance, both the feather and the iron bar will impact the ground at the same time. The correct answer is C) both. This outcome occurs because in the absence of air resistance, all objects fall at the same rate due to gravity. This phenomenon was famously demonstrated on the Moon by astronaut David R. Scott in 1971, where, despite the Moon's lower gravitational acceleration of 1.67 m/s² compared to Earth's 9.81 m/s², both a hammer and a feather were shown to fall at the same rate when dropped from the same height. This validates that acceleration due to gravity is constant and does not depend on the mass of the objects involved.

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Answer: b

Explanation:

The question cannot be answered as posed because a specific chemical reaction and balanced equation are needed to relate the masses of O2 and CO2.

To answer how many grams of CO2 are used when 7.0 g of O2 are produced, we assume the process is a typical combustion or respiration reaction, where CO2 is generated from O2, or vice versa. The balanced chemical equation for the combustion of carbon would typically be C + O2 → CO2. However, since we are given the mass of O2 produced, and not the mass of a carbon-containing fuel that reacts, we cannot proceed to calculate the mass of CO2 without additional information on the specific reaction involved, including the stoichiometry that defines the mass relationship between O2 and CO2. Therefore, we must have a balanced equation or a known reaction to relate the masses of O2 and CO2 produced in order to provide a specific answer.

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9.62 grams of [tex]\( \text{CO}_2 \)[/tex] are used when 7.0 grams of [tex]\( \text{O}_2 \)[/tex] are produced.

One common reaction where [tex]\( \text{O}_2 \)[/tex] is produced and [tex]\( \text{CO}_2 \)[/tex] is consumed is photosynthesis:

[tex]\[ 6 \text{CO}_2 + 6 \text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \][/tex]

From this balanced equation, we see that 6 moles of [tex]\( \text{CO}_2 \)[/tex] produce 6 moles of [tex]\( \text{O}_2 \)[/tex]. This means that 1 mole of [tex]\( \text{CO}_2 \)[/tex] produces 1 mole of[tex]\( \text{O}_2 \).[/tex]

Step-by-Step Solution:

1. Determine the molar mass of [tex]\( \text{O}_2 \)[/tex]:

[tex]\[ \text{Molar mass of O}_2 = 2 \times 16.00 \text{ g/mol} = 32.00 \text{ g/mol} \][/tex]

2. Calculate the moles of \( \text{O}_2 \) produced:

[tex]\[ \text{Moles of O}_2 = \frac{7.0 \text{ g}}{32.00 \text{ g/mol}} = 0.21875 \text{ moles} \][/tex]

3. Use the stoichiometry from the balanced equation:

  From the balanced equation, the mole ratio between[tex]\( \text{CO}_2 \) and \( \text{O}_2 \) is 1:1.[/tex]

 Therefore, the moles of [tex]\( \text{CO}_2 \)[/tex] used is the same as the moles of [tex]\( \text{O}_2 \)[/tex]produced:

[tex]\[ \text{Moles of CO}_2 = 0.21875 \text{ moles} \][/tex]

4. Determine the molar mass of [tex]\( \text{CO}_2 \)[/tex] :

[tex]\[ \text{Molar mass of CO}_2 = 12.01 \text{ g/mol} + 2 \times 16.00 \text{ g/mol} = 44.01 \text{ g/mol} \][/tex]

5. Calculate the grams of \( \text{CO}_2 \) used:

[tex]\[ \text{Grams of CO}_2 = \text{Moles of CO}_2 \times \text{Molar mass of CO}_2 \][/tex]

[tex]\[ \text{Grams of CO}_2 = 0.21875 \text{ moles} \times 44.01 \text{ g/mol} = 9.62 \text{ g} \][/tex]

To dissolve 1.00 g of barium sulfate, we would need 1 L of water.

In order to calculate the amount of water needed to dissolve 1.00 g of barium sulfate, we need to use the molar mass of barium sulfate and the concept of molarity.

The molar mass of barium sulfate (BaSO4) is 233.43 g/mol. We can use this to convert the mass of barium sulfate to moles.

Once we know the number of moles of barium sulfate, we can use the molar ratio between barium sulfate and water to calculate the volume of water needed. The balanced equation for the dissolution of barium sulfate in water is:

BaSO4 (s) + H2O (l) → Ba2+ (aq) + SO42- (aq)

Based on this equation, 1 mole of barium sulfate dissolves to give 1 mole of water. Therefore, to dissolve 1.00 g of barium sulfate, we would need 1 L of water.

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Answer : The number of hydrogen atoms are, [tex]134.89\times 10^{23}[/tex]

Explanation : Given,

Moles of hydrogen atoms = 2.80 mole

As we know that, the formula of ammonium sulfide is, [tex](NH_4)_2S[/tex]. In ammonium sulfide, there are 2 atoms of nitrogen, 8 atoms of hydrogen and 1 atom of sulfur.

Now we have to calculate the number of hydrogen atoms.

As, 1 mole of [tex](NH_4)_2S[/tex] contains [tex]8\times 6.022\times 10^{23}[/tex] number of hydrogen atoms.

So, 2.80 mole of [tex](NH_4)_2S[/tex] contains [tex]2.80\times 8\times \times 6.022\times 10^{23}=134.89\times 10^{23}[/tex] number of hydrogen atoms.

Therefore, the number of hydrogen atoms are, [tex]134.89\times 10^{23}[/tex]

Answer:

Igneous rock basalt.

Explanation:

The ocean crust is made mostly of igneous rock basalt, which comes from lava and the movement of tectonic plates.