The plasma membrane regulates the movement of substances into and out of the cell, maintaining homeostasis.

The primary role of the pulmonary circulation is to transport blood to the lungs for oxygenation.

Drugs are primarily absorbed in the gastrointestinal tract through passive diffusion, which allows for the movement of drugs from an area of higher concentration to an area of lower concentration.

Most benzodiazepines are primarily eliminated through hepatic metabolism.

Most beta-lactam antibiotics are primarily eliminated through renal excretion.

Renal excretion is the primary route for the elimination of most drugs from the body.

Streptococcus bacteria are spherical in shape, classified as cocci.

The liver is the primary site for amino acid metabolism, where transamination and deamination occur.

ATP synthesis primarily occurs in the mitochondria through oxidative phosphorylation.

The glomerulus is the primary site of filtration in the nephron, where blood is filtered to form urine.

The proximal convoluted tubule is the primary site for glucose reabsorption in the nephron, utilizing active transport mechanisms.

Calcium phosphate is the primary source of calcium in milk, contributing to its high calcium content.

NADH and FADH2 are the primary sources of electrons for the electron transport chain.

During prolonged exercise, the body primarily utilizes fatty acids as a source of energy once glycogen stores are depleted.

Most aquatic microbes, especially phytoplankton, utilize sunlight as their primary source of energy through photosynthesis.

Most bacteria utilize organic compounds as their primary source of energy during growth.

Ammonia is the primary source of nitrogen for the synthesis of non-essential amino acids through transamination.

Albumin, or egg white, is the primary source of protein in eggs.

The Gram stain is the primary method used to classify bacteria based on their cell wall composition.

The primary structure of a peptide refers to the linear sequence of amino acids linked by peptide bonds.

Viruses are primarily composed of a protein coat called a capsid that encases their genetic material.

The primary structure of RNA is composed of nucleotides, which are the building blocks of RNA.

Glucose is the primary substrate for fermentation, as it is readily metabolized by many microorganisms.

Diarrhea is the primary symptom of a Salmonella infection.

HIV primarily targets CD4+ T cells, which are crucial for the immune response.

HIV primarily targets CD4+ T lymphocytes, which are crucial for the immune response.

Sulfonamides target dihydropteroate synthase, inhibiting folic acid synthesis.

Clostridium botulinum produces botulinum toxin, which is responsible for the symptoms of botulism.

Vancomycin is commonly used as a first-line treatment for Clostridium difficile infection.

Infections caused by Actinomyces are primarily treated with antibiotics.