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
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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.
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.
Why can't many molecules, like sugar and proteins, pass freely across the lipid bilayer of plasma membranes?
What will be an ideal response?
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.