Mixed Deck — All CLEP Topics Flashcards

Which condition is NOT required for Hardy-Weinberg equilibrium to apply to a population?

Answer: Small population size

Hardy-Weinberg equilibrium requires a large (ideally infinite) population, so small population size violates the assumptions.

Which component of the endomembrane system is most directly involved in lipid synthesis?

Answer: Smooth endoplasmic reticulum

The smooth ER lacks ribosomes and is specialized for lipid synthesis, including phospholipids and steroids.

Which statement about mutations and natural selection is most accurate?

Answer: Mutations are random; selection acts on the variation they create

Mutations arise randomly and independently of need; natural selection then acts on the phenotypic variation they generate.

Which displays the Western music history's eras in the proper order?

Answer: Medieval, Renaissance, Baroque, Classical, Romantic, and 20th century

Explanation: Medieval, Renaissance, Baroque, Classical, Romantic, and 20th century is the historical eras of Western music in chronological order. The term "Gregorian" describes a kind of Capella liturgical music popular during the medieval era. The Baroque era saw the invention of the musical genre known as opera. A popular style of painting during the Romantic musical era was expressionist. Music that lacks a central note, or key, became popular in the 20th century.

Which part of the human body produces insulin?

Answer: Pancreas

The pancreas produces insulin to regulate blood sugar levels.

Tay-Sachs disease results from a deficiency of a lysosomal enzyme that normally breaks down gangliosides. In which organelle do the undegraded gangliosides accumulate?

Answer: Lysosomes

Without the functional hydrolase (hexosaminidase A), gangliosides cannot be broken down and accumulate within lysosomes, causing neuronal dysfunction.

Penicillin kills bacteria by which mechanism?

Answer: Inhibiting cell wall (peptidoglycan) synthesis

Penicillin inhibits transpeptidase enzymes that cross-link peptidoglycan in bacterial cell walls, causing osmotic lysis of growing bacteria.

A cross between a black chicken (BB) and a white chicken (bb) produces all blue-grey (splash) offspring. When two splash chickens are crossed, the expected offspring ratio is:

Answer: 1 black : 2 blue-grey : 1 white

Incomplete dominance: Bb (splash) × Bb gives 1 BB (black) : 2 Bb (splash) : 1 bb (white).

Which reinforcement schedule produces behavior most resistant to extinction?

Answer: Variable-ratio schedule

Variable-ratio schedules deliver reinforcement after an unpredictable number of responses, producing the highest response rates and greatest resistance to extinction — similar to gambling.

What phenomenon causes the apparent bending of light as it passes between media?

Answer: Refraction

Refraction is the bending of light as it changes speed between media.

Which biogeochemical cycle involves the conversion of atmospheric N₂ into ammonia by bacteria?

Answer: Nitrogen cycle

Nitrogen fixation, carried out by bacteria such as Rhizobium, converts atmospheric N₂ into ammonia (NH₃), making nitrogen available to plants.

Homologous chromosomes pair up to form bivalents (tetrads) during which phase of meiosis?

Answer: Prophase I

During prophase I, homologous chromosomes undergo synapsis facilitated by the synaptonemal complex, forming bivalents (each consisting of four chromatids).

A retailer that specializes in non-perishable goods like furniture and carries a broad selection of them. An example of such is hardware, electronics, etc.

Answer: general merchandise wholesaler

A general merchandise wholesaler deals with a wide variety of non-perishable goods, such as furniture, hardware, and electronics, rather than specializing in a single product line. This broad selection across different categories is the defining characteristic that distinguishes it from specialty or single-line wholesalers. The description perfectly matches the role of a general merchandise wholesaler.

What is the role of tRNA during translation?

Answer: Delivers amino acids to the ribosome matching codons

tRNA molecules carry specific amino acids and deliver them to the ribosome by anticodon-codon base pairing.

What type of cellular transport requires ATP and moves substances against their concentration gradient?

Answer: Active transport

Active transport uses ATP energy to pump molecules against their concentration gradient through specific carrier proteins.

When both alleles for a trait are fully and separately expressed in a heterozygous individual, such as in the AB blood type in humans, this is an example of:

Answer: Codominance

Codominance occurs when both alleles in a heterozygous pair are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive, but shows both traits simultaneously. The AB blood type is a prime example, where both A and B antigens are present on the surface of red blood cells.

An organism that occupies a broad ecological niche and tolerates a wide range of environmental conditions is called:

Answer: A generalist

Generalists (eurytopic species) can exploit many different types of food, habitats, and conditions, making them highly adaptable compared to specialists.

What is the topic sentence's role in a paragraph?

Answer: It states the main idea of the paragraph.

A topic sentence presents the paragraph's central point.

The concept of 'survival of the fittest' in evolutionary biology most precisely means:

Answer: Individuals with the highest reproductive success in their environment

Fitness in evolutionary biology refers specifically to an organism's reproductive success — its ability to survive and pass on its genes to the next generation.

In prokaryotes, DNA is located in which region of the cell?

Answer: Nucleoid region

Prokaryotes lack a membrane-bound nucleus; their circular DNA resides in an irregularly shaped nucleoid region in the cytoplasm.