a.Which of the following is least likely to be considered as a microbe? (A) a mi

Question

a.Which of the following is least likely to be considered as a microbe?

(A)  a microscopic insect                                          (B)  a bacteriophage

(C)  photosynthetic bacteria                                     (D)  halophilic archaea

(E)  Mycobacterium tuberculosis

b.Eukaryotic cells differ from prokaryotic cells in that

(A)  eukaryotic cells have more complex metabolism(B)  eukaryotic cells are more abundant

(C)  only eukaryotic cells have cytoskeleton              (D)  eukaryotic cells are always larger

(E)  transcription and translation cannot occur simultaneously in eukaryotes

c. The smallest genomes (and the first ones sequenced) tend to be those of

(A)  humans                                                            (B)  bacteria

(C)  archaea                                                           (D)  viruses

(E)  fungi

d. What is a metagenome?

(A)  a list of gene sequences for all the metabolic genes in an organism

(B)  collective metabolic capabilities of a group of microbes

(C)  the mutated genome of a metastatic cancer cell

(D)  the proposed genome sequence of the last universal common ancestor of all life

(E)  genome sequences from all the organisms in a particular environment

e. Microbes have shaped human history by

(A)  being the causative agents of human epidemics

(B)  being involved in the production of certain food products

(C)  playing essential roles in the geochemical cycling of many elements

(D)  all of the above

(E)  A and B only

f. Which of the following individual first observed single-celled microbes?

(A)  John Tyndall                                                     (B)  Antoni van Leeuwenhoek

(C)  Louis Pasteur                                                   (D)  Robert Hooke

(E)  Lazzaro Spallanzani

Explanation / Answer

Answer

a) A) a microscopic insect

b) E) transcription and translation cannot occur simultaneously in eukaryotes

Explanation :in eukaryotes, transcription occurs in a membrane-bound nucleus while translation occurs outside the nucleus in the cytoplasm. Prokaryotic transcription and translation can occur simultaneously

c) (D) viruses

d) E) genome sequences from all the organisms in a particular environment

Explanation :All the genetic material present in an environmental sample, consisting of the genomes of many individual organisms

e) (B) Antoni van Leeuwenhoek

Explanation : He is called father of microscopy he observed sperm blood cells and bacteria through microscope

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