Line 1: *Cancer is a disease that occurs when the cell cycle is no longer regulated. Another critical protein in regulating the cell cycle is the tumor suppressor protein p53 . Cancer is a disease that often results when tumor suppresor proteins, like p53, stop functioning.*
*(B)*
Line 2: *One tumor suppressor protein which often results in cancer when it stops functioning is:
Options:
- (A) gene
- (B) p53
- (C) tumors
- (D) HIV
- (E) enzyme
- (F) tRNA
- (G) DNA
- (H) TRH*
Logic of a solution: *Streams may start with runoff or water seeping out of a spring. Lakes and streams are sources of drinking water. Water seeping out of a spring is a source of drinking water.*
*(E)*
The original question: *What is a source of drinking water?
Options:
- (A) ice expanding in rock openings
- (B) helping to prevent floods
- (C) industrial runoff
- (D) it helps plants in growing
- (E) Water seeping out of a spring
- (F) salt water
- (G) polluted water
- (H) Something with a head, thorax, and abdomen*
Line 1: *Male dogs use pheromones in urine to mark their territory. During Urination Dog's urine is used as a scent marker for other dogs. Male dogs mark their territory with a scent marker.*
*(E)*
Line 2: *How do male dogs mark their territory?
Options:
- (A) Chemical energy
- (B) Hot dog eating contest
- (C) Adequate signage
- (D) with their fur
- (E) Scent marker
- (F) heat produced
- (G) mate with females
- (H) Paint*
Logic of a solution: *Cell division is more complex in eukaryotes than prokaryotes. Asexual cell division is called Mitosis. Mitosis is more complex in eukaryotes than prokaryotes.*
*(F)*
The original question: *What is more complex in eukaryotes than in prokaryotes?
Options:
- (A) plants
- (B) cell immigration
- (C) cell establishment
- (D) pollen
- (E) explosions
- (F) mitosis
- (G) A computer
- (H) orchids*
Line 1: *Sight is the ability to sense light, and the eye is the organ that senses light. Eyes detect light, organized into images that fall on the retina. Eyes can detect images and see light using sight.*
*(B)*
Line 2: *Eyes can detect images and see light using what?
Options:
- (A) vibrations
- (B) sight
- (C) lenses
- (D) sound
- (E) Energy.
- (F) Energy
- (G) touch
- (H) voltage*
Line 1: *Muscles can only contract. Bones work with muscles to perform movement. Contraction enables bones to perform movement.*
*(A)*
Line 2:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
*What enables bones to perform movement?
Options:
- (A) contraction
- (B) Energy
- (C) sensory neurons
- (D) looseness
- (E) Chemical energy
- (F) Vibrates
- (G) fur and fat
- (H) layers of fat*