Notes, summaries, assignments, exams, and problems for Biology

Characteristics of a Balanced Diet

To maintain a balanced diet, consider the following:

• Eat five moderately sized meals a day to aid digestion.
• Consume a variety of foods from all food groups, following the recommended amounts in the food pyramid or food wheel.
• Incorporate fruits and fresh vegetables daily for essential vitamins.
• Choose fiber-rich foods to promote healthy bowel movements.
• Include unsaturated fats and limit saturated fats and cholesterol to reduce the risk of cardiovascular diseases.
• Consume carbohydrate-rich foods like bread, pasta, rice, and legumes regularly.
• Minimize sugar intake.
• Moderate salt consumption to prevent high blood pressure.
• Reduce the intake of processed and sugary foods (cakes, sweets, etc.).
• Drink 1.5 to 2 liters of

Initial care of newborn

• The most important care is to
– Position
– Dry
– Keep warm
– Stimulate to breathe
• When wrapping newborn, make sure to
cover head

Normal range of vital signs:
– Pulse – greater than 100/min
• Can check pulse at brachial artery
• Can also check pulse at umbilical cord
– Respirations – should be > 30 breaths/min
• A crying baby is a good thing!
– Color – pink is good – may be a little blue at
the extremities initially, but should continue to
pink up

• Repeat suctioning as needed
• Continue to stimulate to breathe if needed
– Rub back
– Flick soles of feet
• If the newborn doesn’t begin to breathe, or
continues to have trouble breathing after 1
minute, additional measures have

Understanding Our Senses

What do all the senses have in common?

The eye, the ear, the nostrils, and the tongue are organs adapted to capturing specific stimuli. They have a high concentration of specialized receptors.

The Ear

Outer ear: flap, external ear canal. Middle ear: eardrum, ossicles (small bones). Inner ear: semicircular canals, cochlea, Eustachian tube.

Why Avoid Loud Noises?

Loud noises can eventually cause hearing problems and, in extreme cases, a perforated eardrum.

How Do We Perceive Colors?

Inside our eyes are cells that function as sensors in the retina, called rods and cones.

Rods and Cones

• Rods: Activated in darkness, allowing us to distinguish black, white, and shades of gray. They enable us to perceive contrast.
• Cones: Work during

DNA-RNA: Chemical Composition

Formed by deoxyribonucleotides made up of phosphate, deoxyribose, and nitrogenous bases (adenine, guanine, cytosine, thymine), and by ribonucleotides made up of phosphate, ribose, and uracil.

Molecular Structure

Double-stranded structure and single.

Types

1. Nuclear DNA found in chromatin, mitochondrial DNA in mitochondria, plastid DNA in chloroplasts.
2. Messenger (mRNA), transfer, ribosomal.

Cell Location

1. Chloroplast, mitochondria, nucleus.
2. Cytoplasm, free or associated with ribosomes.

Function

1. Contains the organism's genetic info.
2. Synthesizes proteins according to genetic info in DNA.

Replication

Molecule of DNA replicates in the nucleus.

1. The double helix of DNA opens and the strands separate.
2. Free nucleotides attach to the separated

List the Most Important Functions of Blood

• Heating: transporting or regulating body heat
• Transport nutrients and O2 to the cell
• Defense mechanism against pathogens
• Transport CO2 waste from cells
• Transport of hormones: insulin

Why the Circulatory System is Vital

• Because it keeps the cells provided with what they need and removes what they need to get rid of.
• By blood is the means by which some organs influence other organs to perform functions (HORMONES)

Identify the Main Types of Blood Vessels

Observe the Blood Components

A. CENTRIFUGATION...

PLASMA... Continue reading "Understanding the Circulatory System: Functions and Types" »

Cell Structure and Function

Cell Membrane

The cell membrane is a dynamic structure known as the fluid mosaic model, consisting of:

• Phospholipid Bilayer: Forms the basic structural framework.
• Proteins: Integral proteins (embedded in the membrane) and peripheral proteins (attached to the membrane surface).
• Cholesterol: Provides stability and regulates fluidity.
• Carbohydrates: Often attached to proteins (glycoproteins) or lipids (glycolipids) for cell recognition.

Energy Flow and Metabolism

• Energy Flow: From sunlight to producers (photosynthesis) and then through consumers (cellular respiration).
• Matter Cycling: Carbon, nitrogen, and other elements cycle through living organisms and the environment.
• Metabolism Types: Anabolism (building molecules) and Catabolism

Pharyngeal Arches

• First Arch: Mandibular nerve, Meckel's cartilage, muscles of mastication, tensor tympani, mylohyoid, anterior belly of the digastric
• Second Arch: Facial nerve, Reichert's cartilage (hyoid bone), muscles of facial expression, posterior belly of the digastric, stylohyoid, stapedius
• Third Arch: Glossopharyngeal nerve, hyoid bone, stylopharyngeus muscle
• Fourth Arch: Vagus nerve, laryngeal cartilages, soft palate muscles (except tensor veli palatini), pharyngeal muscles (except stylopharyngeus)
• Fifth Arch: Vagus nerve, no specific structure, arytenoid muscle
• Sixth Arch: Vagus nerve (recurrent laryngeal), no specific structure, intrinsic muscles of the larynx (except cricothyroid and arytenoid)

Pharyngeal Pouches

• First Pouch: Auditory tube

Microorganisms: Definitions and Characteristics

Place the correct number in the boxes to match the organism with its definition.

1. Fungus: A spore-producing organism that absorbs nutrients from the environment.
2. Protist: Any eukaryotic organism that is not an animal, plant, or fungus.
3. Bacteria: A prokaryotic organism with peptidoglycan in its cell walls.
4. Archaea: A prokaryotic organism without peptidoglycan in its cell walls.
5. Virus: A microscopic particle that cannot replicate on its own.

Understanding Hosts in Biology

A host is:

• An infected protein
• A prokaryotic organism
• A living thing that a virus or parasite uses for shelter
• A cell destroyed by a virus

Extreme Habitats of Archaea

Label these extreme habitats of Archaea with the correct names from the box:... Continue reading "Microorganisms, Reproduction, and Species Classification" »