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Which of the following molecules is a carbohydrate?
Question 1 Explanation:
The correct answer is (D). Anything that ends in the suffix –ose is a sugar and sugars are carbohydrates.
Use the diagram below to answer questions 2–3.
Which part of the diagram is showing a monomer?
Question 2 Explanation:
The correct answer is (B). Monomers are small units that are joined together to form polymers.
Use the diagram below to answer questions 2–3.
Which part of the diagram shows a condensation reaction?
Question 3 Explanation:
The correct answer is (D). Condensation reactions occur when monomers are connected by the removal of a water molecule.
There are four levels of protein structure. Which level includes the coils of the α helix and the folds of the β pleated sheets?
Question 4 Explanation:
The correct answer is (B). Primary structure refers to the sequence of amino acids. Secondary structure includes the α helix and the β pleated sheets. Tertiary structure is the overall shape of the protein. Quaternary structure consists of two or more polypeptide chains aggregated into a functional macromolecule.
Which of the following statements correctly describes the difference between saturated and unsaturated fats?
Saturated fats tend to be solid at room temperature; unsaturated fats are liquid at room temperature
Saturated fats are cannot pack together closely because of their bent structure; unsaturated fats can pack together because they are flat
Saturated fats come from plants and fish; unsaturated fats are from animals (except fish)
Saturated fats are considered “healthy” fats; unsaturated fats may contribute to cardiovascular disease
Question 5 Explanation:
The correct answer is (A). Saturated fats tend to be solid at room temperature and are mostly obtained from animal, not plant, sources. Unsaturated fats are liquid at room temperature and are primarily obtained from plants and fish sources. Healthful diets tend to be higher in unsaturated fats and lower in saturated fats.
Which of the following nucleic acids is not found in RNA?
Question 6 Explanation:
The correct answer is (B). In RNA, thymine (nucleic acid present in DNA) is replaced with uracil.
Which group of organelles works together to regulate protein traffic and performs metabolic functions of the cell?
Golgi apparatus, endoplasmic reticulum, lysosomes, and vacuoles
Nucleus and ribosomes
Mitochondria, chloroplast, peroxisome
Nuclear envelope, nucleolus, chromatin
Question 7 Explanation:
The correct answer is (A). The eukaryotic cell’s genetic functions are housed in the nucleus and carried out by the ribosomes. The mitochondria and chloroplasts change energy from one form to another. The nuclear envelope, nucleolus and chromatin are all part of the nucleus.
Although animal cells lack cell walls, they have a complex network of glycoproteins that provide structure and strength to the cell, referred to as:
Question 8 Explanation:
The correct answer is (B). Desmosomes are intercellular junctions that function like rivets. Intermediate filaments are a group of cytoskeletal elements. The cytoskeleton refers to the fibers that organize activities and structures inside the cell.
Which group of cellular structures form the endomembrane system?
Microtubules, microfilaments and intermediate filaments
Endoplasmic reticulum, golgi apparatus, lysosomes, and vesicles
Mitochondria and chloroplasts
Fimbriae, nucleoid, flagella
Question 9 Explanation:
The correct answer is (B). Microtubules, microfilaments and intermediate filaments are parts of the cytoskeleton structure. The endoplasmic reticulum, golgi apparatus, lysosomes, and vesicles form the endomembrane system. The mitochondria and chloroplasts change energy from one form to another. Fimbriae, nucleoid and flagella are components of a prokaryotic cell.
If you were late to biology class, and the instructor was discussing hyphae, chitin and mycelium, what could you assume was the topic for the day’s discussion?
Question 10 Explanation:
The correct answer is (C). Hyphae (filaments forming the body of fungi), chitin (found in fungal cell walls) and mycelium (feeding network fungi) are all parts of fungi.
This is an example of:
Question 11 Explanation:
The correct answer is (A). Resource partitioning allows similar species to coexist by using different sets of resources.
The importance of the wolf species in the ecosystem has led conservation biologists to consider the wolves to be a(n):
Question 12 Explanation:
The correct answer is (C). Keystones species are those that exert such a strong control on community structure that if they are removed from the ecosystem, there will be dramatic negative impacts.
In which nutrient cycle does bacteria play a key role in the conversion of an essential organic compound from its atmospheric form to a form usable by organisms?
The water cycle
The carbon cycle
The nitrogen cycle
The phosphorus cycle
Question 13 Explanation:
The correct answer is (C). In the nitrogen cycle, nitrogen-fixing bacteria convert nitrogen gas (N2), which is not usable by plants, to a form that is usable by plants. These nitrogen-fixing bacteria reside in the root nodules of legumes.
What process describes how the DDT became toxic in the top predators of the ecosystem a decade after it was applied?
The greenhouse effect
The law of conservation of mass
Question 14 Explanation:
The correct answer is (D). Biological magnification is the process by which toxins accumulate, becoming more concentrated, as they move up the food chain.
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