In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
A) autotrophs and heterotrophs
B) producers and primary consumers
C) photosynthesizers
D) autotrophs
E) green plants
Ans: D) autotrophs
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A. pheromones. B. sight. C. solar bands. D. smell. E. pheromones and solar bands.
Which of the following will be found in testes and ovaries to make the steroid hormones?
a. chloroplast b. mitochondria c. rough ER d. peroxisome e. smooth ER
Humans belong to which subgroup of mammals?
A) Marsupials B) Monotremes C) Eutherians D) Cetaceans
A mother expresses the symptoms for Huntington's disease, an autosomal dominant trait. What are the chances that her offspring would carry a mutated allele if her partner is unaffected by the disease?
A. 0–25% B. 25–50% C. 50–100% D. 75% E. 100%