A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?
A) Eukarya
B) Archaea
C) Animalia
D) Protista
E) Fungi
Answer: B
Biology & Microbiology
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Sucrose is composed of:
A. two ketose sugars. B. a six-carbon sugar and a five-carbon sugar. C. a simple sugar and a nucleotide. D. an aldose and a ketose. E. glycerol and three fatty acids.
Biology & Microbiology
Hair is made up mostly of
a. calcium b. keratinized cells. c. carbohydrates. d. fats. e. chitin.
Biology & Microbiology
Radiation damage to DNA can result in _____.
a) cell death b) malignant disease c) genetic changes d) any of the above
Biology & Microbiology
Hepatitis B virus
A. transmission risks include shared needles, anal intercourse, and heterosexual intercourse. B. has many chronic carriers. C. is principally transmitted by blood. D. is transmitted to the newborn from chronic carrier mothers. E. All of the choices are correct.
Biology & Microbiology