NLN NEX Science - Poker Exams

Question 1

The inherited factors that are transmitted in an organism from generation to generation are called its

Your Answer: Option(s)

Correct Answer: Option(s) C

Rationale

The inherited factors that are transmitted in an organism from generation to generation are called its genotype.

A genotype refers to the genetic makeup of an organism. It is made up of the alleles or versions of genes that an organism inherits from its parents. The genotype is responsible for an individual's characteristic traits and is what gets passed on from parents to offspring in the process of reproduction.

A) Phenotype
Phenotype refers to the observable traits or characteristics of an organism, such as color, shape, and size. While the phenotype is determined by the genotype, it can also be influenced by environmental factors. Therefore, it is not the inherited factor that is transmitted from generation to generation.

B) Heterozygote
A heterozygote is an organism that has two different alleles for a particular trait. While a heterozygote's specific combination of alleles may be passed on to its offspring, the term does not refer to the entire set of inherited factors in an organism.

D) Homozygote
A homozygote is an organism that has two identical alleles for a particular trait. Similar to heterozygote, a homozygote's specific combination of alleles may be inherited by its offspring, but the term does not encompass the entire set of inherited factors.

Conclusion
The inherited factors that are transmitted in an organism from generation to generation are referred to as the genotype. This encompasses all the genetic information contained in an organism's DNA. Phenotype, heterozygote, and homozygote, on the other hand, refer to observable traits, organisms with two different alleles for a trait, and organisms with two identical alleles for a trait, respectively, and do not refer to the entire set of inherited factors.

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Question 2

A cell which manufactures a large amount of protein for export would have an abundance of organelles called

Your Answer: Option(s)

Correct Answer: Option(s) B

Rationale

Ribosomes are found in abundance in a cell that manufactures a large amount of protein for export.

Ribosomes are cellular organelles that synthesize proteins. In cells that produce a large amount of proteins for export, such as those found in the pancreas or liver, there is a high concentration of ribosomes to facilitate this high level of protein synthesis.

A) Peroxisomes
Peroxisomes are organelles that contain enzymes used to oxidize certain molecules, including detoxification of harmful substances and the breakdown of fatty acids. They are not directly involved in protein synthesis, making them an incorrect choice.

B) Ribosomes
As previously mentioned, ribosomes are the protein factories of the cell. They are involved in the process of translating genetic information into proteins. In cells that produce large amounts of protein for export, the number of ribosomes is significantly increased to accommodate this high level of protein production.

C) Lysosomes
Lysosomes are involved in the digestion of cellular waste and foreign substances. They contain enzymes that break down these substances into smaller particles that can be reused by the cell. While lysosomes are important for overall cell health and function, they are not directly involved in protein synthesis.

D) Centrioles
Centrioles are involved in cell division, specifically in the formation of the spindle fibers that separate chromosomes during mitosis. While they are critical for cell reproduction, they do not play a direct role in protein synthesis.

Conclusion
In a cell that manufactures a large amount of protein for export, ribosomes would be the most abundant organelle as they are directly responsible for protein synthesis. Peroxisomes, lysosomes, and centrioles, while essential for other cellular functions, do not contribute to protein synthesis and export directly, making them incorrect choices for this question.

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Question 3

Which of the following molecules is an electrolyte normally found in the blood?

Your Answer: Option(s)

Correct Answer: Option(s) B

Rationale

Ca2+ is an electrolyte normally found in the blood.

Calcium ions (Ca2+) are a type of electrolyte, which are minerals in your blood and other body fluids that carry an electric charge. Calcium is needed for the heart, muscles, and nerves to function properly and for blood to clot.

A) H2O
Water (H2O) is not an electrolyte. Although it is crucial for life and is the primary solvent for electrolytes in the body, it does not itself carry an electric charge or contribute to the body's mineral balance.

B) Ca2+
Calcium (Ca2+) is indeed an electrolyte. It carries a positive charge and is essential for many bodily functions, including muscle contraction, nerve function, and blood clotting. Its levels in the blood are tightly regulated by hormones such as parathyroid hormone and vitamin D.

C) Lactase
Lactase is an enzyme, not an electrolyte. It's produced in the small intestine and its function is to break down lactose, a type of sugar found in milk and other dairy products, into glucose and galactose.

D) Iodine
Iodine is a trace element, not an electrolyte. It's needed by the body in small amounts to make thyroid hormones, but it does not carry an electric charge, nor is it found in significant concentrations in the blood.

Conclusion
Among the given choices, only Ca2+ is an electrolyte normally found in the blood. Water (H2O) is the universal solvent but is not an electrolyte. Lactase is an enzyme involved in digestion, and iodine is a trace element important for thyroid hormone synthesis. Neither lactase nor iodine are electrolytes. Electrolytes like Ca2+ are critical for several bodily functions and maintaining the body's overall homeostasis.

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Question 4

During translation, the cell produces proteins by using information from

Your Answer: Option(s)

Correct Answer: Option(s) C

Rationale

mRNA is used by the cell to produce proteins during translation.

During the process of translation, the cell reads the genetic information stored in the mRNA (messenger RNA) to create proteins. mRNA carries the instructions from the DNA to the ribosome, where the actual protein synthesis takes place.

A) siRNA
Small interfering RNA (siRNA) is not used to produce proteins during translation. Instead, siRNA plays a role in the RNA interference pathway, where it interferes with the expression of specific genes. It functions by degrading mRNA after transcription, thus preventing it from being used in protein synthesis.

B) tRNA
Transfer RNA (tRNA) is involved in the translation process but it does not carry the information used to create proteins. Instead, tRNA transports specific amino acids to the ribosome based on the codon sequence in the mRNA. Each tRNA molecule carries a specific amino acid that corresponds to the codon it recognizes on the mRNA.

D) rRNA
Ribosomal RNA (rRNA) is a component of the ribosome, the site where protein synthesis takes place. While rRNA plays a crucial role in binding mRNA and tRNA during translation, it does not contain the genetic information used to produce proteins.

Conclusion
During translation, the genetic information required for protein synthesis is carried by mRNA. While tRNA, rRNA, and siRNA all play important roles in the process, it is the mRNA that carries the instructions from the DNA for protein synthesis. Therefore, the cell uses information from mRNA to produce proteins during translation.

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Question 5

The process by which needed nutrients enter the bloodstream of an animal is called

Your Answer: Option(s)

Correct Answer: Option(s) D

Rationale

Absorption is the process by which needed nutrients enter the bloodstream of an animal.

Absorption is the physiological process where the digested food molecules pass from the gastrointestinal tract into the bloodstream. This whole process occurs in the small intestine where the nutrients are absorbed by the villi, tiny finger-like projections that increase the surface area of the intestine.

A) Integration
Integration, in a biological context, is more related to the nervous system. It refers to the process by which the nervous system processes and interprets sensory information and decides what actions to take. It has nothing to do with the process of nutrient uptake into the bloodstream.

B) Osmosis
Osmosis is a specific type of passive transport in which water molecules move across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration. While osmosis is crucial for maintaining cellular hydration, it does not directly involve the transfer of nutrients into the bloodstream.

C) Assimilation
Assimilation is a broader term for the combination of processes that convert nutrients into usable substances within an organism's body. Absorption is a part of this larger process, but assimilation also includes digestion, which is the breakdown of food into smaller molecules, and incorporation of these molecules into the body's cells.

D) Absorption
Absorption is the correct answer. This is the process that occurs in the small intestine where nutrients from digested food are absorbed into the bloodstream through the intestinal walls. It is a critical process for the delivery of nutrients to the body's cells.

Conclusion
Absorption is the specific process by which digested nutrients are taken up into the bloodstream from the gastrointestinal tract. Integration and osmosis do not directly involve nutrient uptake, while assimilation refers to a broader set of processes that includes digestion and cellular incorporation, as well as absorption. Therefore, the correct answer to the question is absorption.

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The inherited factors that are transmitted in an organism from generation to generation are called its genotype.

Ribosomes are found in abundance in a cell that manufactures a large amount of protein for export.

Ca2+ is an electrolyte normally found in the blood.

mRNA is used by the cell to produce proteins during translation.

Absorption is the process by which needed nutrients enter the bloodstream of an animal.

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