What do plants build their cell walls from?
Options:
- (A) By wind and rain
- (B) Deposition
- (C) Deposition.
- (D) algae
- (E) Chemical energy
- (F) plant wall
- (G) plant material
- (H) polysaccharides
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Let's think first: Plants use cellulose for their cell walls. Another important polysaccharide is cellulose. Plants use a polysaccharide for their cell walls.... So the answer is [(H)]

Cells with damaged dna are more likely to divide when exposed to what?
Options:
- (A) harmful substances
- (B) apoptotic genes
- (C) sulfur dioxide
- (D) a tumor suppressor
- (E) Electrical energy
- (F) heat or cold
- (G) immune system
- (H) a carcinogen
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Let's think first: Oncogenes promote the division of cells with damaged DNA. Carcinogenic or oncogenic effects cause cancer. Carcnogenic substances can promote division of cells with damaged DNA.... So the answer is [(H)]

What do all vertebrates have?
Options:
- (A) fur and fat
- (B) sensory neurons
- (C) Veins and arteries.
- (D) four limbs
- (E) jaws and scales
- (F) a slimy coat
- (G) jaw and a backbone
- (H) feathers
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Let's think first: Vertebrates are all chordates that have a backbone. All chordates have jaws. Vertebrates have a jaw and a backbone.... So the answer is [(G)]

What gets converted into the type of energy that animal cells need?
Options:
- (A) photosynthesis
- (B) solar energy
- (C) sugar
- (D) UV
- (E) food
- (F) water
- (G) Energy
- (H) Light
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Let's think first: Glucose is used for energy by the cells of most organisms. Food is converted into glucose. Food is converted into the type of energy that most cells use.... So the answer is [(E)]

What does a hairy organism have under its skin to help insulate the body?
Options:
- (A) fat
- (B) hair
- (C) food
- (D) cell
- (E) nerves
- (F) coat
- (G) fur
- (H) marrow
--
Let's think first: Mammals have a layer of fat under the skin to help insulate the body. If it has hair it is a mammal. An organism with hair has a layer of fat under the skin to help insulate the body.... So the answer is [(A)]

What uses semiochemicals in urine to mark territory?
Options:
- (A) koalas
- (B) bacteria
- (C) humans
- (D) dogs
- (E) bears
- (F) cats
- (G) the Sun
- (H) rabbit
--
Let's think first: Male dogs use pheromones in urine to mark their territory. Pheromones are a sub-category of semiochemicals. Male dogs use semiochemicals in urine to mark their territory.... So the answer is [(D)]