NLN - ? PRACTICE TEST SCIENCE PAX
EXAM ALL STUDY GUIDE 2022
An organism with chloroplast in its cell is probably a - Answer- autotroph
autotrophs -
... [Show More] Answer- are organisms that produce their own food from inorganic
substances, plants are autotrophs
heterotrophs - Answer- obtain their food by consuming plants or other animals. They
are also referred to as consumers.
Primary consumers may be herbivores
herbivores - Answer- plant eaters
omnivores - Answer- plant and meat eaters
Secondary consumers - Answer- are carnivores, meat eaters, or omnivores that eat
herbivores.
Tertiary consumers are carnivores that eat - Answer- other carnivores or omnivores.
What property of water allows someone to fill a glass slightly above the rim without
the water flowing over? - Answer- surface tension
Water molecules are polar. This is due to the fact that oxygen draws the electrons in
the molecule toward itself. Thus, there is a negative charge surrounding the oxygen
and a positive charge around the hydrogen. The unbalanced charges cause the
water molecules to cluster, and this gives the water the properties called surface
tension. Surface tension is the the attraction between molecules at the surface of a
liquid, which allows a glass to be filled above the rim without the water flowing over.
The gap between the neurons are called - Answer- synapses
Which group of chemicals are not normally found in most living things? - Answersilicates
Carbohydrates, proteins and nucleic acids (RNA and DNA) are all very important
chemicals in living things.
Silicates examples are in sand and glass
The alimentary canal is associated with the - Answer- the whole passage along
which food passes through the body from mouth to anus. It includes the esophagus,
stomach, and intestines.
digestive tract
The numerous villi in the small intestine serve to - Answer- provide greater surface
area for absorption
As light passes obliquely from air to water, it is bent. The bending is called - Answerrefraction
refraction is the bending of light as it passes obliquely from one medium to another,
in this case from air to water. The speed of light wave changes changes when it
changes media. When the light wave enters the second medium at an oblique angle,
it changes direction; the light wave is bent.
diffraction - Answer- refers to the spreading of light waves as they pass through a
narrow opening
reflection - Answer- occurs when light bounces off an object.
dispersion - Answer- occurs when light is separated into its spectrum
Which of the following organelles is not involved in protein synthesis? - Answermitochondrion
To be absorbed by cells, proteins must be changed into - Answer- amino acids
A neuron that transmits impulses from the receptors to the spinal cord is called -
Answer- a sensory neuron
Potential energy can be thought of a function of height. Since total energy is always
conserved, the kinetic energy is at its maximum when the potential is at its minimum.
- Answer- or at the bottom of the incline.
Which group of organisms can helps prevent the accumulation of organic wastes in
nature? - Answer- mosses is an algae
the correct answer is bacteria = bacteria comprise the decomposer portion of the
food chain. They are responsible for recycling organic material into inorganic
material that plants can use to undergo photosynthesis.
As the eardrum is made to vibrate more rapidly, the sound is perceived as - Answerhigher in pitch
high pitch sounds are heard when the receptor cells closer to the oval window are
stimulated, and low-pitch sounds result from the stimulation of the cells that are
farther down the cochlea. The more rapid the vibration is, the higher the pitch
In a field of pure white asters, a grower noticed a single blue aster. How could the
grower test whether this change affected the gamete-producing cells of the plant? -
Answer- self-pollinate the flower, and plant the resulting seeds.
Self pollination would allow the plant to produce gametes sperm and eggs that would
unite and form seeds. Observing the color of the plants from these seeds would
allow the planter to determine whether this change occurred at the level of the
gametes.
A human egg will develop into a female if it is fertilized by a sperm containing -
Answer- XX chromosome
XY - male`
In a food chain involving grass, grasshoppers, birds, and mammals, the original
source of energy is - Answer- sunlight
Which of the following is an neutralization reaction?
H2CO3 + Ca(OH)2 ---> 2H2O + CaCO3
Is an reaction between an acid (carbonic acid) and a base [Ca(OH)2] to form water
and a salt. - Answer- A reaction that removes essentially all H+ and OHIn the context of a chemical reaction the term neutralization is used for a reaction
between an acid and a base
acid + base → salt + water
Acids are ionic compounds ( a compound with a positive or negative charge) that
break apart in water to form a hydrogen ion (H+).
Example: HCl (Hydrochloric acid) in water
*Bases are ionic compounds that break apart to form a negatively charged hydroxide
ion (OH-) in water.
Example: NaOH (Sodium Hydroxide-a strong base) in water
When oxygen goes from air in the lungs into the blood, it does so by - Answerdiffusion
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