What is leukemia?
A low white blood cell count
A low platelet count
A high red blood cell count
Cancer of blood cell producing tissue
In the body, ____ blood arteries serve as the conduits for the exchange of oxygen and carbon dioxide
What distinguishes a hypothesis from a theory?
A theory is not falsifiable; a hypothesis is falsifiable.
A theory and a hypothesis are different terms for the same thing.
A theory is a comprehensive explanation of a phenomenon; a hypothesis is a generalized statement that can be used to generate testable predictions
A theory is a fact; a hypothesis is a comprehensive explanation.
____ is the name given to the accumulation of plaque in artery walls
A hypothesis must be ____ to be considered scientifically valid
phrased as a question
testable and falsifiable
based on faith
Inflammation of the arteries
Inflammation of the veins
Inflammation of the capillaries
Ballooning of a region of an artery
Methanogens are certain archaeans. Swamps, cows’ guts, and even human colons are home to certain methanogens. What gas does methanogen metabolism result in the emission of?
Which of the following environments is the one where severe halophiles are most likely to be found?
Great Salt Lake
How does caffeine affect your level of energy?
Caffeine stimulates the nervous system.
Caffeine provides both calories and stimulates the nervous system
Caffeine inhibits nerve impulses
Caffeine speeds up blood circulation.
Chestnut blight, a form of ____ infection, nearly led to the demise of the American chestnut.
When you have a cold, why does food taste bland?
Much of what we perceive as taste is actually smell.
The lack of desire to eat when ill causes food to taste bad
A cold increases the rate at which taste buds die and replacement taste buds are formed at a slower-than-usual rate
A cold causes taste receptors to malfunction
The ____ is the biggest component of the brain
Compared to other cell types, archaeans resemble ____ cells more
Nonvascular plants have a flagellum in their sperm. As a result, their sperm reach the egg by _____
being blown there in the air
being pollinated by bees
swimming in water
crawling along the ground
Starfish move using their:
LSD originated from:
From where did sponges originally come?
____ is used to evaluate the heart’s electrical activity
There are auditory receptors in the _____
Which of the above phrases describes the blood pressure reading taken while the heart is beating?