Ques and Ans: Viral envelopes are sometimes made of fats and what?
Options:
- (A) cellulose
- (B) glucose
- (C) Energy.
- (D) protein
- (E) viral particles
- (F) Energy
- (G) food
- (H) bacteria
(D)
Logic for the answer: Some viruses have an envelope of phospholipids and proteins. Phospholipids are body fats, too. Some viruses have an envelope of fats and proteins.


Ques and Ans: What are not cells at all, so they are neither prokaryotes nor eukaryotes?
Options:
- (A) Something with a head, thorax, and abdomen
- (B) Microscopic organisms
- (C) The smallest agent of disease
- (D) Dead prehistoric beings
- (E) female sex cells
- (F) major threat to health
- (G) remains of prehistoric life
- (H) Something that smells like rotten eggs
(C)
Logic for the answer: Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. Viruses Viruses are the smallest agents of disease. The smallest agents of disease are not cells at all, so they are neither prokaryotes nor eukaryotes.


Ques and Ans: What has woody stems covered with bark?
Options:
- (A) sunflowers
- (B) Newton
- (C) ferns
- (D) seaweed
- (E) Most plants
- (F) palm trees
- (G) evergreens
- (H) orchids
(G)
Logic for the answer: Trees have woody stems covered with bark. Orange trees are evergreen trees. Evergreens have woody stems covered with bark.


Ques and Ans: What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish
(G)
Logic for the answer:
Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.