Which DNA bases pair together?
A–T and C–G
What is the smallest level of organization in living things?
Cell
Which two systems work together when you pull your hand away from a hot stove?
Nervous and muscular
The term used to describe Internal regulation, balance
Homeostasis
Which type of cell division is used for growth and repair?
Mitosis
having two identical alleles of a particular gene or genes
homozygous
What do we call any change in DNA?
Mutation
What level is made of similar cells working together?
Tissue
Which system absorbs nutrients, and which system transports them?
Digestive and circulatory
Why is nutrient absorption important for homeostasis?
Cells need energy to function
Which type of cell division makes sperm and egg cells?
Meiosis
the passing on of physical or mental characteristics genetically from one generation to another
Heredity
A mutation that helps an organism survive is called what?
Beneficial mutation
Put these in order: organ, cell, organism, tissue, system
Cell → Tissue → Organ → System → Organism
Where does oxygen enter the blood?
The lungs
What happens to the body if one organ system fails?
Other systems are affected
If a parent cell has 4 chromosomes, how many will each daughter cell have after mitosis?
4
Traits that are covered up by the dominant traits.
recessive traits
Why does sexual reproduction help populations survive mutations better than asexual reproduction?
It increases genetic variation
Why does damage to one level affect the others?
Each level depends on the one below it
Trace oxygen: lungs → ___ → arteries → body cells
Heart
Breathing alone isn’t enough to deliver oxygen to cells, what other system is working with the respiratory system?
The circulatory system must transport it
Why do chromosomes line up in the middle of the cell before dividing?
To make sure each new cell gets the correct chromosomes
Black fur in rabbits is dominant (F), white fur is recessive(f). What genotype would a white rabbit have to have?
ff
A mutation helps bacteria survive antibiotics but does nothing otherwise. What type of mutation is this?
Beneficial
Which level of organization includes the heart, lungs, and stomach working together?
Organ system
Why is cooperation among organ systems essential for survival?
To maintain internal balance (homeostasis)
Which organ releases insulin when blood sugar rises?
Pancreas
Which process reduces the chromosome number by half—and why is that important?
Meiosis; it prevents chromosome doubling