Cells are programmed to _ only a set number of times.
Options:
- (A) migrate
- (B) expand
- (C) A computer
- (D) Most plants
- (E) allow growth
- (F) reproduce
- (G) contract
- (H) constrict
--
Let's think first: Cells are programmed to divide only a set number of times. Cells reproduce asexually, by dividing. Cells are programmed to reproduce only a set number of times.... So the answer is [(F)]


Changes in what are essential for evolution to occur.
Options:
- (A) color of leaves
- (B) genetic material
- (C) learned behavior
- (D) synthetic material
- (E) the body's largest organ
- (F) acquired characteristics
- (G) sensory neurons
- (H) Most plants
--
Let's think first: Mutations are essential for evolution to occur. Mutations are changes in the genetic material. Changes in the genetic material are essential for evolution to occur.... So the answer is [(B)]


Molecules of trna and amino acids are assembled where?
Options:
- (A) nucleoli
- (B) A computer
- (C) Cooking
- (D) Most plants
- (E) boiling
- (F) animals
- (G) Power plants
- (H) retina
--
Let's think first: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. Ribosomes are assembled in the nucleoli. Molecules of tRNA and amino acids are assembled in the nucleoli.... So the answer is [(A)]


What affects the respiratory and circulatory systems in the body?
Options:
- (A) HIV
- (B) sulfur
- (C) smog
- (D) stress
- (E) fever
- (F) sweat
- (G) heat
- (H) tar
--
Let's think first: Air pollution harms the respiratory and circulatory systems. An example of an air pollution reaction is the production of photochemical smog. Smog harms the respiratory and circulatory systems.... So the answer is [(C)]


What is part of an animal's excretory system?
Options:
- (A) alveoli
- (B) garbage chute
- (C) pollen
- (D) glucose
- (E) bloodstream
- (F) kidneys
- (G) food
- (H) intake
--
Let's think first: Organs of excretion make up the excretory system. Leptospiral organisms cause infection in the kidneys and are excreted in urine. Kidneys are part of the excretory system.... So the answer is [(F)]


Dilation occurs when part of a cell that a what does not have relaxes.
Options:
- (A) breathing
- (B) organ
- (C) the eyes
- (D) abrasion
- (E) complex
- (F) animal
- (G) nerves
- (H) retina
--

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
Let's think first: Dilation occurs when cell walls relax. Animals have no cell walls. Dilation occurs when part of a cell that an animal does not have relaxes.... So the answer is [(F)]