A. chromatin
B. Histones
C. ATP
D. Plasmids
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Rationale
Chromatin refers to a complex of DNA and proteins in human cells. This material is packaged by histones to make up the chromosomes. The chromosomes then contain genetic information that is heritable.
Therefore, the Correct Answer is A.
Use the table below to answer the question
|
Object |
Mass |
Time of Fall |
|
A |
5.0g |
2.0 sec |
|
B |
5.0g |
1.0 sec |
|
C |
30.g |
0.5 sec |
|
D |
35.0g |
1.5 sec |
Which of the following conclusions is supported by the data?
A. Object A and B fall at the same rate
B. The time of fall is independent of the mass of the object
C. The greater the mass of an object, the faster it will fall
D. Air resistance is greater for A than for B
The Correct Answer is D.Objects A and B have the same and are subjected to the same gravitational pull. However, object B falls faster than A. This is due to a greater air resistance for A than B.
Which of the following distinguishes endocrine and exocrine glands from another?
A. The presence or absence of ducts
B. The effect their secretions have on the target cells
C. The biochemistry of their secretions
D. The presence or absence of nerve innervation
The Correct Answer is A.Exocrine glands secrete their products into ducts that carry them to the target organs. In contrast, endocrine glands secrete their products directly into the bloodstream, which carries them to target cells throughout the body.
A slice of apple left on a table slowly goes brown due to an enzymatic reaction. Dipping the apple slice in lemon juice prevents it from browning Which of the following best explains this result?
A. Lemon juice has enzymes which reverse the browning reaction
B. Lemon juice has a pH which inactivates the enzymes
C. Lemon juice functions to bleach the brown material
D. Lemon juice functions to dilute the brown material
The Correct Answer is B.Browning of the apple surface is due to the action of the enzyme polyphenol oxidase. Lemon juice is acidic and lowers the pH of the apple's surface. This inactivates the enzyme polyphenol oxidase, which works best at a neutral pH. This in turn reduces the browning action on the apple.
Which of the following demonstrates a chemical reaction of water?
A. Water boils to produce steam at 100° C (252)
B. Water Dissolves sugar
C. Water produces gas with sodium metal
D. Water and all separate when combined
The Correct Answer is C.a. Water boils to produce steam at 100°C - This is a phase change (from liquid to gas) and not a chemical reaction of water.
b. Water dissolves sugar - This is a physical change, not a chemical reaction of water.
c. Water produces gas with sodium metal - This reaction involves the chemical reaction of water with sodium metal to produce hydrogen gas.
d. Water and oil separate when combined - This is a physical separation, not a chemical reaction of water.
Which of the following types of cells stimulates other immune cells to attack and destroy foreign agents?
A. Cytotoxic T-cells
B. Plasma cells
C. Natural killer cells
D. Helper T-Cells
The Correct Answer is D.Helper T cells are important cells that stimulate the action of other immune cells. For instance, they not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
in which of the following locations does fertilization of an egg cell typically occur?
A. Fallopian Tube
B. Ovary
C. Uterus
D. Cervical canal
The Correct Answer is A.Fertilization occurs in the fallopian tube and not in the ovary, uterus, or cervical canal.
The "gray matter of the brain is largely made up of which of the following?
A. Neuron cell bodies
B. Meninges
C. Neuron cell axons
D. Corpus callosum
The Correct Answer is A.The gray matter of the brain primarily consists of neuron cell bodies, along with dendrites, glial cells, and unmyelinated axons. It appears gray because it lacks the white fatty myelin sheath that covers many nerve fibers.
Which of the following characteristics of water helps explain why coastal areas experience less dramatic temperature changes during the day?
A. Water has a high specific heat capacity
B. Water is a versatile solvent
C. Water forms covalent bonds with other water molecules
D. Water's adhesive properties prevent evaporation
The Correct Answer is A.Water has a high specific heat capacity, which means it can absorb and store a large amount of heat energy without significantly changing in temperature. This helps moderate the temperature fluctuations of the air near the coast, as water can store heat during the day and release it at night, or vice versa.
Which of the following structures is present in both prokaryotic and eukaryotic cells
A. Chloroplast
B. Cell membrane
C. Golgi apparatus
D. Endoplasmic reticulum
The Correct Answer is B.Both prokaryotic and eukaryotic cells have a cell membrane. The cell membrane is a barrier that surrounds the cell and separates its internal environment from the external environment.
A represents atomic mass and 2 represents an atomic number, which of the following describes an atom after a proton is emitted?
A. A-1,2-1
B. A-1,2+1
C. A,2-1
D. A+1,2-1
The Correct Answer is A.This is because when a proton is emitted from an atom, the atomic mass decreases by one unit, and the atomic number decreases by one unit. The atomic mass is the sum of protons and neutrons in the nucleus, and the atomic number is the number of protons in the nucleus. Therefore, if a proton is lost, both numbers decrease by one.