Science shs Flashcards
(19 cards)
A base sequence is shown below. ACAGTGC How would the base sequence be coded on mRNA?
C. UGUCACG
The fight-or-flight response includes greater heart output and a rise in blood pressure. This response is due to
D. adrenaline
What is the greatest danger to a patient who has had damage to the skin?
C. infections in uncovered tissues
Individuals with HIV sometimes contract a pneumonia infection that is rare in the rest of the population because
A. they are unable to fight off these pneumonia-causing organisms
Striking the tendon just below the kneecap causes the lower leg to jerk. Moving an object quickly toward the face can cause the eyes to blink shut. These are examples of
C. reflex reactions
Which statement best describes the density of an atom’s nucleus?
D. The nucleus occupies very little of the atom’s volume but contains most of its mass
What do the results of firing alpha particles at gold foil show about the nucleus?
B. The nucleus is small and is the densest part of the atom
Under the same conditions of pressure and temperature, a liquid differs from a gas because the molecules of the liquid
C. have stronger forces of attraction between them
Iodine would have chemical properties most like
C. chlorine (Cl)
Why didn’t ancient civilizations include planets in constellations?
D. They do not maintain fixed positions relative to other planets or stars
Which statement best describes how the planets of the solar system formed?
D. They formed from a nebular cloud of dust and gas
Which planet was formed from the light gases of the outer solar nebula?
D. Uranus
Fusion of hydrogen to helium is a reaction that commonly occurs in
A. the Sun and other typical stars
The surfaces of Mercury and our moon contain large craters most likely caused by
B. asteroid impacts
A 50-kg child on a skateboard experiences a 75-N force. What is the expected acceleration?
B. 1.50 m/s²
A communication satellite is in circular orbit. If its speed is constant, the force acting on the satellite
C. points toward the center of Earth at all times
A student holds a book at rest in an outstretched hand. The force exerted on the book by the student is equal to the book’s
B. weight
A ball is dropped from 6.0 meters and hits the ground in 1.1 seconds. What is its average speed?
A. 5.5 m/s
A 10-newton force and a 15-newton force act in opposite directions. What additional force must be added to produce equilibrium?
A. 5 N acting in the same direction as the 10-N force
