Which statement is false regarding prokaryotic cells?
A) They have a circular loop of DNA instead of multiple linear DNA molecules.
B) They lack a nucleus.
C) They are always single-celled organisms that are invisible to the naked eye.
D) They never contain organelles.
E) They contain cytoplasm but never a plasma membrane.
E) They contain cytoplasm but never a plasma membrane.
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A botanist discovers a new seed-forming plant. She notices that this plant lacks a vascular cambium and also appears to form new roots at the base of its stem. How should this plant be classified? Select all correct choices
A. as an angiosperm B. as a cycad C. as a conifer D. as a monocot E. as a eudicot
In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution
d. a number of mutant alleles e. one mutant allele in several genes
A liver cell from a human male has:
A) 23 pairs of autosomes and two X chromosomes. B) 46 pairs of autosomes, an X chromosome, and a Y chromosome. C) 22 pairs of autosomes and two X chromosomes. D) 22 pairs of autosomes, an X chromosome, and a Y chromosome.
Proteins are one of the most ubiquitous, diverse, and functional types of molecule. Which of the following is one of the functions of protein?
a. insulation b. energy c. catalyzing reactions d. clarity