AZSCI Structure and Function 2

Question 1

A microbiologist discovers a new species of archaea thriving in a highly acidic hot spring.
Which cellular adaptation is most likely responsible for its ability to maintain homeostasis in this extreme environment?

Accepted Answer

A specialized cell membrane with unique, highly stable lipid structures.

Answer

A high concentration of lysosomes to neutralize incoming acidic particles.

Answer

A cell wall composed primarily of cellulose for rigid structural support.

Answer

An overabundance of mitochondria to generate excess energy for pH regulation.

Question 2

A patient is diagnosed with a genetic disorder that impairs the function of the smooth endoplasmic reticulum in their liver cells. Which of the following consequences is most likely?

Accepted Answer

Reduced ability to detoxify certain drugs and metabolic byproducts.

Answer

Impaired synthesis of ribosomal RNA and ribosome assembly.

Answer

Failure to correctly fold and modify proteins destined for secretion.

Answer

Decreased production of ATP through cellular respiration.

Question 3

A marathon runner's leg muscles are highly resistant to fatigue. A biopsy of their gastrocnemius muscle would likely reveal that the muscle fibers have a higher-than-average density of which organelle compared to a sprinter's equivalent muscle?

Accepted Answer

Mitochondria

Answer

Golgi apparatus

Answer

Lysosomes

Answer

Rough endoplasmic reticulum

Question 4

A botanist observes that a plant's new, upper leaves are showing interveinal chlorosis (yellowing between the veins) while the older, lower leaves remain green. This specific pattern suggests a deficiency in an immobile nutrient. The transport and availability of this nutrient are directly related to the function of which specialized plant tissue system?

Accepted Answer

Xylem, which is responsible for water and mineral transport.

Answer

Phloem, which is responsible for sugar transport.

Answer

Parenchyma, which is used for general storage.

Answer

Epidermis, which provides a protective outer layer.

Question 5

Which of the following correctly describes the hierarchical level of organization for the regulation of metabolism, from the most fundamental unit to the most complex system?

Accepted Answer

Islet of Langerhans cell -> Pancreas -> Endocrine System -> Organism

Answer

Mitochondrion -> Cardiac Muscle Cell -> Heart -> Circulatory System

Answer

Neuron -> Nerve Tissue -> Brain -> Nervous System

Answer

Alveolus -> Lung Tissue -> Lung -> Respiratory System

Question 6

The sea slug *Elysia chlorotica* can incorporate chloroplasts from the algae it eats into its own digestive cells, a process called kleptoplasty. For a limited time, these sequestered chloroplasts continue to photosynthesize, providing the slug with energy. This unique adaptation represents an unusual intersection between which two levels of biological organization?

Accepted Answer

Cell and Organism

Answer

Organelle and Tissue

Answer

Organ and Organ System

Answer

Population and Community

A microbiologist discovers a new species of archaea thriving in a highly acidic hot spring.Which cellular adaptation is most likely responsible for its ability to maintain homeostasis in this extreme environment?

A microbiologist discovers a new species of archaea thriving in a highly acidic hot spring.
Which cellular adaptation is most likely responsible for its ability to maintain homeostasis in this extreme environment?