Biologists use nomenclature or the binomial to provide each species with a unique scientific name. Our species is called Homo sapiens. The first word refers to which taxonomical grouping?

A. Kingdom
B. Phylum
C. Order
D. Genus
E. Species


Answer: D

Biology & Microbiology

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Some bacteria stain Gram-positive and others stain Gram-negative because of differences in the structure of their:

A) capsule. B) cell membrane. C) cell wall. D) ribosomes.

Biology & Microbiology

When measuring membrane potential, the tip of a microelectrode is inserted into a(n)

a. axon. b. node of Ranvier. c. Schwann cell. d. dendrite. e. glial cell.

Biology & Microbiology

Why can't many molecules, like sugar and proteins, pass freely across the lipid bilayer of plasma membranes?

What will be an ideal response?

Biology & Microbiology

For each of the following sentences, choose one of the options enclosed in square brackets to make a correct statement about nucleosomes

A. Nucleosomes are present in [prokaryotic/eukaryotic] chromosomes, but not in [prokaryotic/eukaryotic] chromosomes. B. A nucleosome contains two molecules each of histones [H1 and H2A/H2A and H2B] as well as of histones H3 and H4. C. A nucleosome core particle contains a core of histone with DNA wrapped around it approximately [twice/three times/four times]. D. Nucleosomes are aided in their formation by the high proportion of [acidic/basic/polar] amino acids in histone proteins. E. Nucleosome formation compacts the DNA into approximately [one-third/one-hundredth/one-thousandth] of its original length.

Biology & Microbiology