The alternative forms of a gene that can be expressed are known as
A) alleles.
B) genes.
C) loci.
D) spores.
E) haplotypes.
A) alleles.
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Ater-soluble substances easily pass through the phospholipid bilayer of a cell membrane
Indicate whether this statement is true or false.
Bacteriophages and animal viruses
A. both may enter a host cell by endocytosis. B. both may enter a host cell by fusion. C. both involve entry of the entire nucleocapsid. D. differ because bacteriophages leave the capsid outside the cell, while animal virus entry involves the entry of the whole nucleocapsid.
Which MAP protein kinase is the last to be activated in the MAP kinase pathway?
a. Ras b. Raf c. ERK d. Mek e. tyrosine
Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that _____.
A) fossils found in a given area look like the modern species in that same area B) the environment where it lived was very warm C) mammals evolved from a reptilian ancestor D) Antarctica and South Africa separated after Thrinaxodon went extinct