In which of the following types of waters do seasonal climatic temperature changes result in distinct chemical and microbial stratification?
A. Oceans
B. Lakes in tropical areas
C. Fast flowing rivers
D. Lakes in temperate areas
Answer: D
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Basic dyes are
A. anionic. B. attracted to the acidic surface of bacterial cells. C. dyes such as India ink and nigrosin. D. used in negative staining. E. repelled by cells.
Which of the following is the correct
difference between rough endoplasmic reticula and smooth ER?
a. rough ER is an extension of the nuclear envelope; smooth ER is not b. smooth ER has a double bilayer membrane; rough ER does not c. smooth ER consists of flattened sacs and tubes; rough ER does not d. rough ER has a surface studded with ribosomes; smooth ER does not e. smooth ER synthesizes proteins: rough ER does not
What stage of development involves cell division without cell growth?
A. gastrulation B. organogenesis C. fertilization D. cleavage E. neurulation
Crossing over occurs during ________ and is important because it ________
A) prophase I; generates variation B) metaphase I; reduces the chromosome number by half C) anaphase II; separates the homologous pairs D) telophase II; creates daughter cells