Where does dna reside?
Options:
- (A) membrane
- (B) cells
- (C) embryos
- (D) atom
- (E) complex
- (F) nucleotide
- (G) ligt
- (H) retina
--
Let's think first: DNA is found in chromosomes. Genes live on chromosomes, chromosomes live in cells. DNA is found in cells.... So the answer is [(B)]

The first tetrapods were
Options:
- (A) major threat to health
- (B) remains of prehistoric life
- (C) in the frog family
- (D) running and lifting
- (E) competing for resources
- (F) warm-blooded
- (G) objects that have mass
- (H) graptolites
--
Let's think first: Amphibians are the first true tetrapods, or vertebrates with four limbs. All frogs are amphibians. Animals in the frog family are the first true tetrapods.... So the answer is [(C)]

What lacks walls and membranes?
Options:
- (A) deserts
- (B) flower cells
- (C) viruses
- (D) fungi
- (E) tree cells
- (F) bacteria
- (G) plant cells
- (H) alpacas
--
Let's think first: Viruses are not cells. Plant cells are surrounded by a cell membrane and a cell wall. Viruses do not have walls and membranes.... So the answer is [(C)]

What is an arthopod with two wings?
Options:
- (A) rare
- (B) fly
- (C) two
- (D) host
- (E) Aves
- (F) male
- (G) bird
- (H) bats
--
Let's think first: Most arthropods are insects. Flies are insects with two wings. Flies are arthropods with two wings.... So the answer is [(B)]

What increases the stability of ecosystems?
Options:
- (A) overpopulation
- (B) water consumption
- (C) loose soil
- (D) Quality of life
- (E) agriculture
- (F) deforestation
- (G) ecotourism
- (H) trees
--
Let's think first: Biodiversity increases the productivity and stability of ecosystems. Ecotourism, on the other hand, can help to conserve biodiversity. Ecotourism increases the stability of ecosystems.... So the answer is [(G)]

What help prokaryotes to move?
Options:
- (A) organisms
- (B) tentacles
- (C) glucose
- (D) feet
- (E) Energy.
- (F) Energy
- (G) Mitosis
- (H) cilia
--
Let's think first: Flagella help prokaryotes move. Flagella are elongated cilia which moves like a whip or a tail. Cilia help prokaryotes move.... So the answer is [(H)]