Of these fossil species, which one is thought most likely the ancestor of later species of Homo?

A. Homo ergaster
B. Homo habilis
C. Homo rudolfensis
D. Homo sapiens


Answer: A

Biology & Microbiology

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Alternative forms of genes are called

(a) homologues. (b) locus. (c) loci. (d) alleles.

Biology & Microbiology

The lipopolysaccharide (LPS) that is found in the outer membrane of gram-negative bacteria is also known as

A. teichoic acid. B. exotoxin. C. endotoxin. D. murein.

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Which adaptation is constrained by the particular ancestral structure of the organism, resulting in a jury-rigged design?

A) antibiotic resistance in bacteria B) anatomy that allows upright posture in humans C) the wings of bats D) ethanol tolerance in fruit flies

Biology & Microbiology

In eukaryotes, specific transcription factors have two distinct domains, that is

A. a DNA-binding domain and an enhancer domain. B. a DNA-binding domain and a RNA-binding domain. C. a DNA-binding domain and an activation domain. D. a DNA-binding domain and an operator domain. E. a DNA-binding domain and a repressor domain.

Biology & Microbiology