Which of the following components of the cell membrane is responsible for active transport?
a. Phospholipid
b. Protein
c. Lipid
d. Phosphate
e. Cholesterol
Ans: b. Protein
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Which of the following is incorrect about prophages?
A. Replicated with host DNA and passed on to progeny B. Occur when temperate phages enter host cells C. Cause lysis of host cells D. Present when the virus is in lysogeny E. Formed when viral DNA enters the bacterial chromosome
What type of genetic recombination results from the mating of two strains of bacteria F+ and F-?
a. transposition b. plasmid genetic recombination c. conjugation d. histone genetic recombination
The phylogentic tree is most consistent with which of the following hypotheses:
a. The same types of anole lizards evolved independently on each of the islands b. Each lizard type evolved once on one of the islands and then migraded to the other islands where it evolved into different species c. "Each lizard type evolved on the mainland and was brought to each of the islands, where it evolved into different species" d. All species of lizards appeared at exactly the same time on
In plants, the _____ is diploid and multicellular.
a) spore b) gamete c) zygote d) sporophyte