Which of the following statements concerning a blastodisc is false?
a. It can be further divided into an upper epiblast and below that, the hypoblast.
b. It results from meroblastic cleavage.
c. It is found in isolecithal eggs.
d. It is a small disc of cytoplasm at the animal pole.
e. It is characteristic of cell division in bird eggs.
C
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You are studying 12 new isolates from the human skin. The isolates have 16S rRNA sequences that are 97% similar and share important phenotypic traits. Their genomes have 55% of their genes in common. The isolates would most likely be
A) classified as individual strains of the same species. B) classified as individual species of the same genus. C) split into different families. D) classified as the same species if they can mate via conjugation.
Which of the following statements about DNA is (are) true?
A) DNA contains thymine but not uracil. B) DNA molecules contain deoxyribose. C) In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds. D) All of the above statements are true.
The net movement of substances to regions of lower concentration is called
A. facilitation. B. active transport. C. diffusion. D. osmosis.
A virus contains _______ as its genetic material
Fill in the blank(s) with the appropriate word(s).